AstroZap Focusing cap voor 9″ SCT 247mm-266mm

AstroZap Focusing cap voor 8" SCT 216mm-231mm

Astrozap focusing caps with integrated Bahtinov focusing wheel.

Unlike a simple Hartman or Bahtinov mask, the Astrozap focusing cap is a multi-purpose tool which allows for quick ‘shutter-like’ operation. Just turn the wheel to the open position for focusing, and then turn it again to the closed position to keep the dust out, or to image dark frames with your ccd or dslr camera.

The focusing wheel can be easily removed and replaced with an off-axis wheel for off-axis viewing, or an off-axis solar filter wheel for solar viewing on larger telescopes.

Simply turn the thumbscrew to the open position, and turn to close.
No plastic plugs required, and no tools needed.
Optional wheels for off-axis viewing and off-axis solar viewing
available for larger telescopes.
Astrozap focusing caps are made from lightweight aluminum
and powder-coated texture black.

 

Astrozap Dauwlint 1.25 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 1.25 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 1.25 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

AstroZap Dauwkap voor 925 inch Flexi (heated)

AstroZap Dauwkap voor 925 inch Flexi (heated)

AstroZap Dauwkap voor 925 inch Flexi (heated)

Maak een keuze uit de verschillende dauwkappen voor de Celestron C 9.25 telescoop, je kan kiezen uit:

  • Dauwkap, one notch Vixen style AZ-132
  • Dauwkap, two notches Losmandy style AZ-110
  • Dauwkap, Heated, one notch Losmandy style AZ-809-N-1
  • Dauwkap, Heated, two notches Losmandy Style AZ-809-N-2

Het Astrozap Flexi Dew Shield combineert op unieke wijze zowel actieve als passieve methoden van dauwbestrijding. Met de extra functie om de telescoop te beschermen tegen ongewenst strooilicht. Om maximaal gebruik te maken van deze dauwkap heb wel een controller of voeding nodig. Hiermee kan je het verwarmingslint laten verwarmen als de dauw extreem is.

De dauwkappen passen op bijvoorbeeld de Celestron 925 inch HD telescopen, Celestron Evolution 925, Celestron NexStar 925 GPS

Specificaties van de AstroZap Dauwkap voor 925 inch Flexi (heated) zijn:

  • 14 Watts, 12 Volts, 1.18 Amps. Heated versie
  • The Astrozap Flexible Heated Dew Shield uniquely combines both active and passive methods of dew fighting with the added feature of shielding the telescope from undesirable stray light.
  • Felt-lined to help absorb moisture and to prevent extraneous light from reaching the optics and greatly improving contrast.
  • Astrozap heated dew shields are made from the highest quality ABS-grade polymers.
  • Velcro fasteners provide a snug fit and padded so as not to mar or scratch the telescope’s finish.
  • They roll up easily into a convenient size for easy transportation to star parties and dark sky sites.

Levering van de AstroZap Dauwkap voor 925 inch Flexi (heated) omvat:

  • Maak keuze uit dauwkap: Heated / non heated en 1 inkeping / 2 inkepingen

Astrozap Dauwlint 14 tot 16 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 14 tot 16 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 14 tot 16 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

Astrozap Dauwlint 11 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 11 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 11 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

Astrozap Dauwlint 9 en 10 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 9 en 10 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 9 en 10 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

Astrozap Dauwlint 7 en 8 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 7 en 8 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 7 en 8 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

Astrozap Dauwlint 5 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 5 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 5 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

Astrozap Dauwlint 4 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 4 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 4 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

Astrozap Dauwlint 3 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 3 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 3 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

Astrozap Dauwlint 2 inch

AstroZap Dew Heater Dauwlint

Astrozap Dauwlint 2 inch

Nieuw ontworpen Astrozap Dew Heater Straps zijn de beste keuze voor een actief dauwbestrijdingssysteem. Gemaakt met behulp van koolstofvezeltechnologie. Astrozap heeft zijn dauwverwarmingslinten verbeterd door het snoer aan dezelfde kant te plaatsen als het klittenband. Deze verbetering voorkomt overmatige slijtage van de kabel en verkleint de kans dat de kabel aan de apparatuur blijft haken.

Robuustere stiksels verhogen de duurzaamheid en levensduur van het product. Met haar toewijding voor kwaliteit heeft Astrozap voor verhoogde productienormen gezorgd en dat is te zien. Dew Heater Straps van Astrozap zijn gemaakt met geavanceerde koolstofvezeltechnologie en genereren warmte gelijkmatig over de lengte van de band.

De telescoopzijde is gemaakt van materiaal dat de afwerking van de telescoop niet beschadigt of krast. Een verstelbare klittenbandbevestiging zorgt voor een goede pasvorm voor een efficiënte toepassing van warmte.  Dauwlinten van Astrozap hebben een RCA mannelijke aansluiting en kunnen met verschillende dauw controllers worden gebruikt.

Kies de juiste lengte voor uw telescoop of accessoire. Klein beetje overlapping is niet erg.

Alternatieven voor het Astrozap Dauwlint 2 inch zijn als onderstaand:

  • Dauwlint naar keuze:
  • 1.25 inch, Lengte 12.5 cm 12 Volt, 3.1 Watt, 0.25 Ampere (#AZ-701)
  • 2 inch, Lengte 20 cm 12 Volt, 4.2 Watt, 0.35 Ampere (#AZ-702)
  • 3 inch, Lengte 30 cm 12 Volt, 10 Watt, 0.80 Ampere (#AZ-703)
  • 4 inch, Lengte 37.5 cm 12 Volt, 11 Watt, 0.90 Ampere (#AZ-704)
  • 5 inch, Lengte 45 cm 12 Volt, 15 Watt, 1.20 Ampere (#AZ-705)
  • 6 inch, Lengte 60 cm 12 Volt, 17.5 Watt, 1.40 Ampere (#AZ-706)
  • 7/8 inch, Lengte 72.5 cm 12 Volt, 20 Watt, 1.60 Ampere (#AZ-707-08)
  • 9/10 inch, Lengte 92.5 cm 12 Volt, 25 Watt, 2.0 Ampere (#AZ-709-10)
  • 11 inch, Lengte 97.5 cm 12 Volt, 28 Watt, 2.30 Ampere (#AZ-711)
  • 14 inch, Lengte 130 cm 12 Volt, 52 Watt, 4.10 Ampere (#AZ-714-16)

Bekijk de website van Astrozap voor meer informatie.

Voor vragen over onze producten neem je gewoon contact met ons op!

AstroZap Controller voor dauwlint, 4 dauwlinten tegelijk

AstroZap Controller voor dauwlint

AstroZap Controller voor dauwlint

De Astrozap dual channel controller maakt gebruik van puls breedte modulatie technologie. Elk kanaal bestuurt twee uitgangen voor in totaal vier uitgangen.

De Astrozap-dauwregelaar is vervaardigd voor gebruik op 12 volt DC en mag nooit met een andere spanning worden gebruikt. De totale stroomsterkte capaciteit voor alle vier uitgangen is 5 ampère. De controller wordt geleverd met een zes meter snoer uitgerust met een sigarettenaansteker. Een 5-amp zekering is opgenomen in de stekker.

De Astrozap-dauwcontroller kan worden gebruikt om onze Flexi-Heat-dauwschermen en warmtebanden van stroom te voorzien. De RCA-uitgangsaansluitingen zijn geschikt voor dauw linten van andere merken.

De rode voedings-LED geeft aan dat de controller stroom krijgt. De twee rode lampjes bij de uitgangen geven het vermogensniveau van elk kanaal aan. Hoe helderder de rode LED’s, hoe hoger de duty cycle voor dat kanaal. Wanneer de controller op de laagste instelling is ingesteld, is deze effectief uitgeschakeld. Een twee-inch klittenband wordt meegeleverd voor het monteren van de controller op een handig gedeelte van uw telescoopsteun.

Levering van de AstroZap Controller voor dauwlint omvat:

  • AstroZap Dual Channel controller met vier uitgangen.
  • 6 meter snoer met sigaretten plug.

AstroZap Dauwkap voor 11 inch Flexi Heated

AstroZap Dauwkap voor 925 inch Flexi (heated)

AstroZap Dauwkap voor 11 inch Flexi Heated

Het Astrozap FlexiHeat Dew Shield combineert op unieke wijze zowel actieve als passieve methoden van dauwbestrijding. Met de extra functie om de telescoop te beschermen tegen ongewenst strooilicht. Elk FlexiHeat Dew Shield heeft een ingebouwde Astrozap Dew Heater Strap.

Om maximaal gebruik te maken van deze dauwkap heb wel een controller of voeding nodig. Hiermee kan je het verwarmingslint laten verwarmen als de dauw extreem is.

Deze dauwkap past op bijvoorbeeld de Celestron 11 inch HD telescopen. Uitsparing is voor de Losmandy stijl zwaluwstaarten.

Specificaties van de AstroZap Dauwkap voor 11 inch Flexi Heated zijn:
  • 16 Watts, 12 Volts, 1.4 Amps.
  • The Astrozap Flexible Heated Dew Shield uniquely combines both active and passive methods of dew fighting with the added feature of shielding the telescope from undesirable stray light.
  • Felt-lined to help absorb moisture and to prevent extraneous light from reaching the optics and greatly improving contrast.
  • Astrozap heated dew shields are made from the highest quality ABS-grade polymers.
  • Velcro fasteners provide a snug fit and padded so as not to mar or scratch the telescope’s finish.
  • They roll up easily into a convenient size for easy transportation to star parties and dark sky sites.

Levering van de AstroZap Dauwkap voor 11 inch Flexi Heated omvat:

  • Maak keuze uit dauwkap.
  • Dauwkap, Heated, one notch Losmandy style AZ-812-N-1. Keuze 1
  • Dauwkap, Heated, two notches Losmandy Style AZ-812-N-2. Keuze 2

AstroZap Dauwkap voor 8 inch Flexi (heated)

AstroZap Dauwkap voor 925 inch Flexi (heated)

AstroZap Dauwkap voor 8 inch Flexi (heated)

Maak een keuze uit de verschillende dauwkappen voor de Celestron C 8 telescoop, je kan kiezen uit:

  • Dauwkap, Heated one notch Vixen style AZ-817
  • Dauwkap, Heated one notch Losmandy style AZ-820-N-1
  • Dauwkap, Heated, two notches Losmandy Style AZ-820-N-2

Het Astrozap Flexi Dew Shield combineert op unieke wijze zowel actieve als passieve methoden van dauwbestrijding. Met de extra functie om de telescoop te beschermen tegen ongewenst strooilicht. Om maximaal gebruik te maken van deze dauwkap heb wel een controller of voeding nodig. Hiermee kan je het verwarmingslint laten verwarmen als de dauw extreem is.

Deze dauwkappen zijn geschikt voor de Celestron NexStar Evolution 8, 8SE, 8 Edge HD en RASA 8 waarbij de goed moet opletten welke zwaluwstaart je hebt. Smalle zwaluwstaart (Vixen stijl) of bredere zwaluwstaart (Losmandy stijl)

Specificaties van de AstroZap Dauwkap voor 8 inch Flexi Heated zijn:

  • 10 Watts, 12 Volts, .87 Amps.
  • Het Astrozap Flexible Heated Dew Shield combineert op unieke wijze zowel actieve als passieve methoden van dauwbestrijding met de toegevoegde functie om de telescoop te beschermen tegen ongewenst strooilicht.
  • Met vilt gevoerd om vocht te helpen absorberen en om te voorkomen dat vreemd licht de optiek bereikt en het contrast aanzienlijk verbetert.
  • Astrozap verwarmde dauwschermen zijn gemaakt van de hoogste kwaliteit ABS-kwaliteit polymeren.
  • Klittenband bevestiging zorgen voor een goede pasvorm en zijn opgevuld om de afwerking van de telescoop niet te beschadigen of te krassen.
  • Ze rollen gemakkelijk op tot een handig formaat voor gemakkelijk transport naar sterrenfeesten en donkere luchtlocaties.

Levering van de AstroZap Dauwkap voor 8 inch Flexi (heated) omvat:

  • Maak keuze uit dauwkap.
  • Dauwkap, Heated one notch Vixen style AZ-817. Keuze 1
  • Dauwkap, Heated one notch Losmandy style AZ-820-N-1. Keuze 2
  • Dauwkap, Heated, two notches Losmandy Style AZ-820-N-2. Keuze 3

Let op, deze dauwkappen hebben wel een voeding nodig en eventueel een controller om ze te regelen in hoeveel warmte ze afgeven.

Astrozap Dew Shield 4 inch Flexibel voor 4SE/ETX105

Astrozap Dew Shield 4 inch Flexibel voor 4SE/ETX105

Astrozap Dew Shield 4 inch Flexibel voor 4SE/ETX105

Het Astrozap dauwkap is geschikt voor vele Maksutov 4 inch telescopen. Onder andere geschikt voor Celestron NexStar 4SE, 102 SLT Maksutov, Astro Fi 102 Maksutov. Maar ook voor de Meade ETX 105 is dit een geschikte dauwkap.

Omdat deze telescopen geen zwaluwstaart over de hele lengte van de buis hebben, zit er geen inkeping in. Desondanks is de passing perfect doordat er gebruikt wordt gemaakt van vilt.
Bovendien zorgt het ervoor dat er minder geen strooilicht binnen komt.

Onderstaande kenmerken zijn van toepassing op deze dauwkap:

  • De dauwkap is het basisonderdeel van het passieve dauwbestrijdingssysteem. Met als extra kenmerk dat het de telescoop beschermt tegen ongewenst strooilicht.
  • Met vilt gevoerd om vocht te helpen absorberen en om te voorkomen dat licht van buitenaf de optiek bereikt en het contrast aanzienlijk verbetert.
  • Gemaakt van de hoogste kwaliteit ABS-kwaliteit polymeren.
  • VELCRO® Merk bevestigingsmiddelen zorgen voor een goede pasvorm en zijn opgevuld om de afwerking van de telescoop niet te beschadigen of te krassen.
  • Ze rollen gemakkelijk op tot een handig formaat voor gemakkelijk transport naar sterrenfeesten en donkere luchtlocaties.

Levering van het Astrozap Dew Shield 4 inch Flexibel voor 4SE/ETX105 omvat:

  • Dauwkap 4 inch flexibel van Astrozap

Astrozap Flexi-Heat Dew Shield 4-6 inch

AstroZap Dauwkap voor 925 inch Flexi (heated)

Astrozap Flexi-Heat Dew Shield 4-6 inch

Het Astrozap FlexiHeat Dew Shield combineert op unieke wijze zowel actieve als passieve methoden van dauwbestrijding. Met de extra functie om de telescoop te beschermen tegen ongewenst strooilicht. Elk FlexiHeat Dew Shield heeft een ingebouwde Astrozap Dew Heater Strap.

Om maximaal gebruik te maken van deze dauwkap heb wel een controller of voeding nodig. Met de controller controleer je de hoeveelheid warmte die de kap afgeeft. En de dauw weg kan houden.

Specificaties van het Astrozap Flexi-Heat Dew Shield 4-6 inch zijn:

  • 4SE / ETX 105 , 12 Volt, 7.4 Watt, 0.62 Ampere. (#AZ-804).
  • 127 SLT, 12 Volt, 8.6 Watt, 0.76 Ampere. (#AZ-822).
  • 5SE, 12 Volt, 7.5 Watt, 0.64 Ampere. (#AZ-818) . Met Inkeping.
  • 6SE, 12 Volt, 8.6 Watt, 0.76 Ampere. (#AZ-816). Met Inkeping.

Levering omvat:

  • Dauwkap naar keuze:
  • #AZ-804 Flexi Heat dauwkap voor Celestron NexStar 4SE en Meade ETX 105
  • #AZ-822 Flexi Heat dauwkap voor Celestron NexStar 127 SLT en Astro Fi 127
  • #AZ-818 Flexi Heat dauwkap voor Celestron NexStar 5SE, 5SLT, Astro-Fi 5 en Evolution 5
  • #AZ-816 Flexi Heat dauwkap voor Celestron NexStar 6SE, 6SLT, Astro Fi 6 en Evolution 6

 

Astrozap Dew Shield 5 inch Flexibel met inkeping

AstroZap Dew Shield 6 inch Flexibel

Astrozap Dew Shield 5 inch Flexibel

Het Astrozap flexibele dauwkap “Flexi Shield” met inkeping voor een zwaluwstaart past op de Celestron 5SE SCT met zwaluwstaart aan de zijkant van de buis.
Deze dauwkap is geschikt voor meerdere 5 inch telescopen met Vixen stijl zwaluwstaart bevestiging. Vanwege de inkeping in de flexibele dauwkap is de passing om de telescoop perfect.

De onderstaande kenmerken zijn van toepassing op de dauwkap:

  • De dauwkap is het basisonderdeel van het passieve dauwbestrijdingssysteem. Echter als extra kenmerk heeft dat het de telescoop beschermt tegen ongewenst strooilicht.
  • Met vilt gevoerd om vocht te helpen absorberen en om te voorkomen dat licht van buitenaf de optiek bereikt en het contrast aanzienlijk verbetert.
  • Gemaakt van de hoogste kwaliteit ABS-kwaliteit polymeren.
  • VELCRO® Merk bevestigingsmiddelen zorgen voor een goede pasvorm en zijn opgevuld om de afwerking van de telescoop niet te beschadigen of te krassen.
  • Ze rollen gemakkelijk op tot een handig formaat voor gemakkelijk transport naar sterrenfeesten en donkere luchtlocaties.

Levering van het Astrozap dauwkap omvat:

  • Astrozap Flexi Dew Shield voor telescopen met een 5 inch opening. Vixen zwaluwstaart inkeping. (#AZ-117)

AstroZap Dauwkap voor 6 inch telescoop

AstroZap Dew Shield 6 inch Flexibel

Flexibele dauwkap met Vixen inkeping voor 6 inch

AstroZap Dauwkap voor 6 inch telescoop met inkeping voor een zwaluwstaart past op de Celestron 6SE SCT met zwaluwstaart aan de zijkant van de buis.
Deze dauwkap is geschikt voor meerdere 6 inch telescopen met Vixen stijl zwaluwstaart bevestiging. Vanwege de inkeping in de flexibele dauwkap is de passing om de telescoop perfect.

De onderstaande kenmerken zijn van toepassing op de dauwkap:

  • De dauwkap is het basisonderdeel van het passieve dauwbestrijdingssysteem. Echter als extra kenmerk heeft dat het de telescoop beschermt tegen ongewenst strooilicht.
  • Met vilt gevoerd om vocht te helpen absorberen en om te voorkomen dat licht van buitenaf de optiek bereikt en het contrast aanzienlijk verbetert.
  • Gemaakt van de hoogste kwaliteit ABS-kwaliteit polymeren.
  • VELCRO® Merk bevestigingsmiddelen zorgen voor een goede pasvorm en zijn opgevuld om de afwerking van de telescoop niet te beschadigen of te krassen.
  • Ze rollen gemakkelijk op tot een handig formaat voor gemakkelijk transport naar sterrenfeesten en donkere luchtlocaties.

Levering van het AstroZap Dauwkap voor 6 inch telescoop omvat:

  • Astrozap Flexi Dew Shield voor telescopen met een 6 inch opening. Vixen zwaluwstaart inkeping. (#AZ-116)
  • Astrozap 6SE Dauwkap

Plaats je bestelling online of kom langs in de winkel

Heb je gevonden wat je zoekt en wil je bijvoorbeeld de Carson nachtkijker bestellen? Dan doe je dit heel eenvoudig online. Bekijk je deze producten liever in het echt voordat je ze koopt? Ook dat is bij ons mogelijk. Je bent van harte welkom in onze showroom in Amstelveen van maandag tot vrijdag tussen 10.00 en 17.00 uur. Op zaterdag is de showroom ook geopend, maar dan van 10.00 tot 16.30 uur. Voor meer informatie en advies kun je ook telefonisch contact met ons opnemen via 020-6412083. We helpen je graag

Celestron dew heating controller 2x

Celestron dew heating controller 2x

Dew Control Controller, Celestron Smart Dewheater Controller

Work smarter, not harder, when it comes to fighting dew. The Celestron Dew Heater Controller 2x extends your battery life by optimizing power consumption for up to two dew ribbons or rings. The controller collects and analyzes information in real time to warm up your optics just enough to prevent dew.

Connection options

The smart controller comes with two ports to control two dew ribbons or rings at the same time. This way you can use one port to heat your optical tube, while the other heats a second optical tube, a rifle scope, an eyepiece and/or another accessory. The controller also has an additional 12V DC output, so you can power another 12V DC device, such as your mount.

Celestron dew heating controller 2x
Celestron dew heating controller 2x

Combine with Celestron’s new heating rings

This smart controller works seamlessly with Celestron’s Dew Heater Rings, which have a built-in thermistor for temperature readings from the corrector lens. Third party dew ribbons or dew shields with built-in heating ribbon (RCA jack) are also compatible. To get the most out of the smart controller you can use the Celestron Thermistor. This is a temperature sensor that you place between your telescope and the heating tape and measures the correct temperature. This sensor is an optional accessory.

Celestron dew heating controller 2x
Display of the controller

Smart control

The heart of the controller is a powerful microprocessor that collects information from the sensors. This processor calculates the data and then automatically adjusts your dew ribbon or ring. The controller monitors the ambient temperature and humidity using the integrated ambient sensor. In addition, it monitors the temperatures of the Celestron heating ring using the built-in temperature sensor.

You can use the smart controller as a standalone accessory. Or, if you want to view data from the controller and make manual adjustments, you can connect it to the handheld controller of your Celestron telescope or to your PC. The controller works with NexStar+ or StarSense hand controls with the latest firmware or through the Celestron CPWI telescope control software, which is included with every Celestron mount.

Celestron dew heating controller 2x
Example software
Celestron dew heating controller 2x
Example hand controller

Power supply

The smart controller 2x works on a 12V DC battery (like our PowerTank Lithium Pro) and can handle a maximum power of 120W (10A max current @ 12V DC). The controller also features a 12V DC output. You can use this extra port to power another device, such as your mount. This way you feed your entire setup from a single source. Resettable electronic fuses prevent damage if the input or output current becomes too high.

NOTE: If you use two dew ribbons or rings in dew conditions and power another 12V DC device, the controller may be operating near its power limit. In this case, one PowerTank Lithium Pro won’t have enough capacity to run your setup all night. After all, you need a larger capacity battery or multiple batteries.

Celestron dew heating controller 2x
Front of the dew heater controller

Unique industrial design

The Smart DewHeater and Controller 2x has a sturdy metal housing. Inside, a cooling fan protects the controller electronics.

  • The Bridge: on top of the controller, you’ll find the bridge, which houses the device’s status LEDs and environmental sensors. It also helps with cable management. Celestron has positioned the temperature and humidity sensors here. Away from the control box and other components that can generate heat. Unlike competitor products, these sensors do not require additional cables to obtain accurate readings. The LEDs on the bridge indicate the current status of the device. The LEDs provide warnings if the controller is drawing more current than your power source can supply or if the battery needs to be recharged. You can dim the lights if you are under a dark sky.
  • Mounting: the Celestron Smart DewHeater and Controller 2x mounts to your Losmandy or Vixen style dovetail with the integrated dovetail clamps. If you prefer to mount the controller on your tripod leg, use the supplied strap, for example.

Delivery of the Celestron dew heating controller 2x includes:

  • Smart controller for dew ribbons or rings 2x
  • Tripod attachment by means of strap
  • Power cable with cigarette lighter plug and 5.5×2.1 connector
  • Power cable with 5.5×2.1 connectors
  • AUX cable for connection to your Celestron mount
  • Temperature sensor extension cable. (Thermistor extension cable)

Specifications of the Celestron Dew Heater Controller 2x are:

  • Heater Outputs: 2x ports equipped with RCA jack, compatible with Celestron Heater Rings and other 3rd Party Heater Ribbons (Dew Ribbons)
  • Temperature sensor connection: 2x ports (one for each dew heater port), 2.5mm audio jack. Compatible with Celestron heating rings and optional Celestron Thermistor (temperature sensor)
  • 12V DC output port: 12V DC barrel connector jack (5.5 x 2.1 mm), 7 A max
  • AUX Ports: 2x ports, allows connection to Celestron mounts for HC control, also allows connection of optional accessories
  • PC Port: USB 2.0 Type B, allows connection to PC for control with CPWI
  • 12V DC power input: Threaded connector, 5.5 x 2.1mm, 10A max input
  • Supplied power cable: Cigarette lighter plug on one end, threaded connector on the other end (5.5 x 2.1 mm), 3 meters long, 10A fuse protected
  • Ambient sensor: measures ambient temperature and humidity, integrated into the housing “bridge” to thermally insulate
  • Housing construction: aluminum with integrated fan
  • Clamp: fits Vixen and Losmandy dovetails (can also be attached to tripod leg)
  • Electronic Protections: Fuse protected, Reverse polarity protected, Low voltage trip
  • Weight: 0.55 kg
  • Dimensions: 139.7mm x 114.3mm x 82.55mm (L x W x H)

Celestron dew heating controller 4x

Celestron dew heating controller 4x

Controller, power supply and USB 3.2 HUB, cable management at its best from Celestron

Work smarter, not harder, when it comes to fighting dew. The Celestron Dew Heater Controller 4x extends your battery life by optimizing power consumption for up to four heating ribbons (dew ribbons) or rings. The controller collects and analyzes information in real time to warm up your optics just enough to prevent dew.

Connection options

The smart controller comes with four ports to control four heating ribbons (dew ribbons) or rings at the same time. First, you can use one port to heat your optical tube. Secondly, heat another optical tube, for example a viewfinder or guide scope and/or an eyepiece or other accessory. The controller is also a complete power management solution for your telescope. The controller provides four 12V DC output ports to power a variety of 12V DC devices, such as your mount, focus motor, and camera. One of the ports has a variable voltage, which you can set from 3V to 12V. In addition, the controller has three powered USB 3.2 ports.

Combine with Celestron’s new heating rings

This smart controller works seamlessly with Celestron’s heating rings, which have a built-in thermistor (temperature sensor) for temperature measurements from the corrector lens. Third party dew ribbons or dew shields with built-in heating ribbon (RCA jack) are also compatible. To get the most out of the smart controller, you can use the Celestron thermistor. This is a temperature sensor that you place between your telescope and the heating tape and measures the correct temperature. This sensor is an optional accessory.

Celestron dew heating controller 4x
Celestron dew heating controller 4x
Celestron dew heating controller 4x
Thermistor (Temperature sensor)

Smart control

The heart of the controller is a powerful microprocessor that collects information from the sensors, calculates the data and automatically adjusts your heating ribbon or ring. The controller monitors the ambient temperature and humidity using the integrated ambient sensor and monitors the temperatures of the heaters using temperature sensors.

You can use the smart controller 4X as a stand-alone accessory. Or, if you want to view data from the controller and make manual adjustments, you can connect it to the handheld controller of your Celestron telescope or your PC. The controller works with NexStar+ or StarSense hand controls with the latest firmware or Celestron CPWI telescope control software, included with every Celestron mount.

Power supply

The Smart DewHeater and Power Controller 4X runs on a 12V DC battery (such as the Celestron PowerTank Lithium Pro) and can handle a maximum power of 240W (20A max current @ 12V DC).

The controller also features four 12V DC output ports, allowing you to power your entire setup from a single source. You can use the extra ports to power devices such as your mount, focus motor and camera(s). One of the power ports provides a variable voltage, which can be adjusted from 3V to 12V. This port is perfect for accessories that use less than 12V DC, such as a DSLR camera.

Once connected, you can control power to each device individually with the hand control or through the CPWI software. Turn off your connected devices without disconnecting them from the controller. All your devices are protected with resettable electronic fuses if the power consumption gets too high.

NOTE: If you are using multiple heating tapes in dewy conditions and powering external 12V DC devices, one PowerTank Lithium Pro will not have enough capacity to run your rig all night. In that case you need a battery with a larger capacity or several batteries.

USB 3.2 hub in the Celestron dew heater controller 4x

The integrated USB 3.2 hub connects three USB devices to your computer with just one cable, greatly simplifying cable management. There are three USB Type A ports and each port is powered. Like the 12V DC ports, you can turn any USB port on or off using CPWI or a Celestron hand control.

Celestron dew heating controller 4x
Display of the controller

Unique industrial design

The Smart DewHeater and Power Controller 4X has a sturdy metal housing. Inside, a cooling fan protects the controller electronics.

  • The bridge: on top of the controller, you’ll find the bridge, which houses the device’s status LEDs and environmental sensors. The bridge also helps with cable management. Celestron has positioned the temperature and humidity sensors here, away from the control box and other components that can generate heat. Unlike competitor products, these sensors do not require additional cables to obtain accurate readings. With the LED lights on the bridge you can see the current status of the device. The LEDs provide warnings if the controller is drawing more current than your power source can supply or if the battery needs to be recharged. You can dim the lights if you are under a dark sky.
  • Mounting: the Celestron Smart DewHeater and Power Controller 4X mounts to your Losmandy or Vixen style dovetail with the integrated dovetail clamps. If you prefer to mount the controller on your tripod leg, use the supplied strap, for example.

Delivery of the Celestron Dew Heater Controller 4x includes:

  • Smart controller for dew ribbons or rings 4x
  • Tripod attachment by means of strap
  • Power cable with cigarette lighter plug and 5.5×2.1 connector
  • Power cable with 5.5×2.1 connectors
  • AUX cable for connection to your Celestron mount
  • Temperature sensor extension cable (thermistor extension cable)

Specifications of the Celestron Dew Heater Controller 4x are:

  • Heater Outputs: 4x ports equipped with RCA jack, compatible with Celestron heating rings and other 3rd party heating belts or dew ribbons
  • Temperature sensor connection: 4x ports (one for each dew heater port), 2.5mm audio jack, compatible with Celestron heating rings and optional Celestron Thermistor (temperature sensor)
  • 12V DC output port: 3x ports, barrel connector jacks (5.5 x 2.1 mm), 7 A max for each port
  • Variable DC output port: 3V-12V variable output, barrel connector jack (5.5 x 2.1 mm), 5A max
  • USB Port: 3x ports, USB 3.2 Type A ports, up to 2.5A output for each port
  • AUX Ports: 3x ports, allows connection to Celestron mounts for HC control, also allows connection of optional accessories
  • PC Port: USB 3.2 Type B, allows connection to PC for control with CPWI
  • 12V DC power input: Threaded connector, 5.5 x 2.1mm, 10A max input
  • High Current 12V DC Input Port: XT60 Jack, 20A Max Input
  • Power cable included: Cigarette lighter socket on one end, XT60 plug on the other end, 3m long, 20A fuse protected
  • Ambient sensor: measures ambient temperature and humidity, integrated into the housing “bridge” to thermally insulate
  • Housing construction: aluminum with integrated fan
  • Clamp: fits Vixen and Losmandy style dovetails (can also be attached to tripod leg)
  • Electronic Protections: Fuse protected, Reverse polarity protected, Low voltage trip
  • Weight: 0.64kg
  • Dimensions: 177.8mm x 114.3mm x 82.55mm (L x W x H)

Information about telescopes

Buy a telescope?

Telescopes, also known as star gazers, both open the human eye to the fascinating world of the universe. It is incredible what you can see with a good telescope. No wonder, then, that many are drawn to these wonderful instruments.

Ganymede has an extensive collection of stargazers / telescopes from the most prominent brands. Think of stargazers from:

  • Celestron (We are the Dutch importer of this brand)
  • William Optics (We are the BeNeLux importer of this brand)
  • Orion
  • Vixen
  • Guan Sheng
  • Lumicon
  • Baader Planetarium
  • 1000 Oaks
  • Astrozap
  • ADM

In general, the telescopes from our range are directly available from stock. We will do everything we can to deliver your order to your home as soon as possible. We can even personally deliver stargazers to your home.

Telescopes, which is the right telescope for you?

Certainly for the novice astronomer it will not be easy to choose from our wide range. The differences between telescopes can be great. Which one best suits your personal wishes? To help you on your way, here is a brief explanation of the different telescopes that are available. If you have any questions, you can always call us or you can visit our showroom to view the stargazers for themselves and get advice. You’re welcome!

When purchasing stargazers, you should first consider the following:

  • Your budget
  • Tripod and mount
  • Telescope type
  • Telescope opening

The guidelines for choosing the right telescope

Stargazers can be quite expensive. Therefore, determine in advance a maximum amount that you want to spend on a telescope. A ready-to-use telescope is recommended for the beginner. You do not need to purchase additional accessories for this, so you can get started with your new hobby right away.

Much more important than is often assumed are the tripod and the mounting of telescopes. After all, the heavier a telescope is, the more solid it must be supported by a stable mount and a stable tripod. Here too there is a choice of several variants. A thick tripod with a sturdy tripod and a heavy mount is ideal. But this is where budget comes into play again: such a solution for stargazers is on the expensive side.

Basically there are three types of telescopes. First of all, there is the Newton system, also called a reflector or mirror telescope. You also have the lens system or refractor. And finally there is the Schmidt-Cassegrain system. Which system you can choose best depends on what you are interested in. A lens system is very suitable if you want to study the moon and the planets. For deep sky objects, a Newton system or even a Schmidt-Cassegrain system is more useful.

The size of the opening of telescopes determines how much you can see. A larger opening catches more light, making the image brighter and allowing you to distinguish more details. A small opening is suitable for viewing the moon and planets; a great one for deep sky objects.

Information about telescopes

Here are a few pros and cons of these systems.

Advantage Newton system:

  • Larger opening compared to the lens system.
  • No problems with color errors.
  • Relatively cheaper because the opening is larger.
  • Well suited for deep sky objects such as nebulae.

Disadvantage Newton System:

  • Cooling time of the main mirror.
  • Collimation of secondary mirror with respect to the main mirror.
  • Obstruction in the light road, secondary mirror suspension.
  • Less suitable for moon and planets.

Advantage Lenses system:

  • Full opening, so no disturbance in the light path.
  • Sharp and high-contrast images.
  • Little to no cool down time.
  • Well suited for moon and planets.

Disadvantage Lenses system:

  • Smaller opening compared to the Newton or Schmidt-Cassegrain system.
  • Color error in the lens, unless the lens consists of more expensive optics.
  • Relatively more expensive due to the smaller openings.
  • Less suitable for deep sky objects.

Advantage of the Schmidt-Cassegrain system:

  • Relatively compact construction while focal length is long.
  • No problems with color errors.
  • Many expansion options.
  • Smaller versions easy to take with you when traveling.
  • Well suited for moon and planets as well as deep sky objects.

Disadvantage of the Schmidt-Cassegrain system:

  • Longer cooling time due to closed mirror system.
  • Collimation of catch mirror relative to main mirror.
  • Obstruction in light away.
  • Mirror flop, although that was more of an issue in the old days.

This is only a guide and is by no means a binding summary of the pros and cons. There are also several systems to mention, but from the point of view for beginners, we leave them out of consideration. We try to give you direction with this.

As a beginner, it is important to think about what you want to observe. If you prefer the moon and planets, then the choice of a lens system is the right one. If you prefer deep sky objects, then you prefer a Newton system or even a Schmidt-Cassegrain. There are also gaps in this, but that later.

A number of things are important when purchasing a telescope:

  • Budget.
  • Tripod and mount.
  • Telescope type.
  • Telescope aperture.

Budget: Set a budget for yourself but use this as a guide, most beginner telescopes are ready to use. This means that everything is included to start the hobby right away. For example the Celestron AstroMaster or Omni XLT series. Excellent telescopes with which to start the hobby. The Omni XLT is a higher quality overall.

Tripod and Mount: Initially, this is often ignored, while in the further course of the hobby this is one of the most important parts. The larger the opening of a telescope, the heavier the telescope becomes. This means that the tripod and mount must also offer more stability. A too large telescope on a limp tripod and mount is a big annoyance. With every touch the image vibrates and shakes. A thick tripod with sturdy thick tripods and a heavy mount with a smaller telescope is actually the ideal image for the hobbyist. But then the budget comes into play again. Tripod and mount are available in several versions. An azimuth haul, a parallactic. Azimuthal mount does nothing but move left and right and up or down. There are several variants available, the normal manual operation, possibly a computer-controlled one such as the Celestron NexStar SLT, SE or CPC series. There are also the Dobson series telescopes. They are often praised for their value for money. You get a lot of opening, it’s a Newton system telescope, azimuth tripod. However, tracking with such a system is not for beginners. It is excellent for quickly viewing many objects. A parallactic mount also has 2 axes that can be rotated. But a parallactic mount can be adjusted to the latitude of the Earth. For the Netherlands, this ranges from approximately 51 to 53 degrees. 51 degrees for Maastricht and 53 for Groningen. We usually suggest setting it to 52 degrees. You can now follow 1 axis and follow the correct orbit that the moon and planets also follow. In the past, these mounts were equipped with fine movement buttons with which you can keep following the object very nicely. Nowadays these mounts are provided with computer control. The position is determined on the basis of the date, time and coordinates and an alignment on 2 stars ensures that the mount knows where it is. The 40,000+ objects available means that you can see a lot in an evening.

Telescope type: You determine this, by making up for yourself what you want to watch, which mainly interests you. It is also important in what area you live. If you live in or around a big city, there will be a lot of light pollution. As a result, you will hardly be able to perceive many objects. Deep sky objects are usually slightly weaker objects and if there is a lot of light pollution, these are almost impossible objects. Moon and planets are often visible. Then the choice for a lens system can be justified. If you live in the countryside where the light pollution is considerably less, you have many more possibilities to observe. Then the choice on a Newton or Schmidt-Cassegrain may be the right one. Not that a lens viewer does not come into its own, but because the conditions are good, you also want to get more out of a telescope.

Telescope aperture: The larger the opening of a telescope, the more light this telescope receives. Moon and planets are bright objects by themselves and are therefore clearly visible even with a smaller aperture telescope. Again, however, the larger the opening, the brighter the image, and the more detail you can see. If we look at galaxies, a telescope with a larger aperture will provide more resolving power. We then see more stars in the galaxy than with a smaller aperture.

There are also a number of keywords that you will encounter a lot on or when using a telescope.

  • Aperture. (D)
  • Magnification.
  • Focal length.(F)
  • Brightness. (f)
  • Eyepiece.
  • Diagonal.
  • Field of view.
  • Seeing.

Regarding the aperture we mean the diameter of the lens or main mirror. The larger the opening, the more light enters, the stronger you can enlarge. As a rule of thumb, we stick to 2x the opening is the maximum magnification. For example, if the opening is 102 mm, the maximum magnification is 204x.

Magnification is determined by dividing the focal point of the telescope by the focal point of the eyepiece. For example the focal point of the telescope is 1000 mm and the focal point of the eyepiece is 25 mm, then the magnification is 40x. The magnification also depends on the seeing, if it is poor you can still enlarge very strongly, but you will not get the image or object sharp. Remains blurry.

The focal length of a telescope, is the point where the rays of light converge after being refracted through the lens. This point is called the focal point and the distance between the lens and the focal point is called the focal length which is often shown in mm. You will often encounter the following on a telescope: D = 102 mm F = 1000 mm depending of course on the aperture and focal length.

The brightness is determined by dividing the focal length by the aperture, often indicated as F / 10 or F / 5, this as an example. The lower the number, the brighter or in technical terms, the faster the telescope is.

The eyepiece is a factor in the magnification but also in the quality of the image. It is a bit of dialogue with the telescope’s optics. To explain it easily, I will give the example of a stereo system. You can have a very good amplifier, but if the speakers are nothing you don’t get out of it. And vice versa, the same applies. The speakers are excellent, but the clock radio is the amplifier, it will never be much. In this example, the speakers are the eyepieces. However, purchasing better eyepieces always improves your image. And because the standard eyepiece size is now 31.7 mm (1.25 ”), this is the diameter of the sleeve of the eyepiece which goes in the diagonal, you can always use the eyepiece on another telescope. She used to use 24.5mm (0.96 ”) eyepieces and now the 50.8mm (2”) are on the rise. Most telescope sets come standard with 31.7 mm eyepieces. These are standard eyepieces and in most cases there is still profit to be made here. It is also desirable to have multiple eyepieces so that you can easily search with the lowest magnification because you have a larger field of view. Once you have found the object, you can use a different eyepiece for a higher magnification.

The diagonal is most commonly used with a lens system and Schmidt-Cassegrain system. With these telescopes you look at the back of the telescope and it is desirable that you can look into it from above. The diagonal is 45 degrees and 90 degrees in it. With a Newton system you always look from the side of the telescope and you do not need a diagonal. A telescope set always has a 90 degree diagonal. This puts the image upright, only the left and right are reversed. This has already been adjusted for some telescope sets. However, this happens with a prism and that often results in some loss in your image.

The field of view of a telescope is partly determined by the focal point of a telescope, the longer the focal point, the narrower the field of view. With binoculars, for example, it often reads 123 m / 1000 m. This means that at 1000 meters you have a field of view of 123 meters wide. This is expressed in degrees for binoculars. This is less with stargazing, but because we look over a longer distance we can have a full view of the moon at a reasonable magnification. Here it will be about 1 degree.

Seeing is a notion that as you get further into matter, and speak to other amateurs, is something they always complain about. The seeing, or to throw in a fancy term, Astronomical Vision, is a term used in astronomy for the influence (blur, “twinkling”) of atmospheric disturbances (turbulence) on the vision through telescopes. Visibility is one of the biggest problems in astronomical observations from Earth.

I have tried to tell in my own words about the principles of stargazing, as we at Ganymede teach someone about a telescope. There are many more aspects to take into account or possibilities. There is nothing about astrophotography in it, but this is a subject that a beginner will not go into yet.

It is actually wise to purchase the first telescope from a company or shop where you can see the telescope, and who can actually explain how it works. Get informed and realize what kind of instrument you get. Most telescopes are on a tripod and this is actually larger than can be seen on a photo. Most telescopes are also easy to disassemble and store, often in 3 main parts, tripod, mount and telescope.

There are many models available on the market, of any brand at various toy stores or online bookstores. However, there is a lot, if not a lot of junk in between. Do not be tempted to buy a toy telescope for little money. In that case, buy binoculars so that they can at least explore the sky. With a toy telescope you ruin the interest more than you arouse it. You can see in our store what is cheap, we do not recommend this, but you can also see what you buy something for many nice evenings viewing pleasure.

I hope that with the help of this text you have become a bit wiser in the matter of stargazing, and that you dare to take the step to discover the untold great night sky. We, Jeroen, Peter and Paul, are ready to help you on your way. It takes a lot of patience and perseverance, but you get something special in return.

Hitec Astro digital dew controller 4 channels

Hitec Astro digital dew controller 4 channels

Now also a digital version of the Hitec Astro dew controller.

With this Hitec Astro digital dew controller 4 channels you can connect and control the output on four separate heating ribbons (not included). Most heating tapes from all major manufacturers are supported via standard RCA connectors. For example the dew ribbons from AstroZap and our own brand.

Power

Total output power up to 8 amps. You need to make sure that your power supply can provide enough power for your requirements, bearing in mind that other equipment, such as your mount and cameras, also need power.
Each output can be independently set to the desired output level in 20% increments. A cigarette lighter plug with a 10 amp fuse and a 2 m cable are included.

The digital controller has an internal memory, your last settings are stored in the internal memory. In this way you can maintain a constant heat level.

Includes 1 x DSLR power output – (requires dummy battery)

Delivery of the Hitec Astro digital dew controller 4 channels includes:

  • Hitec Astro controller 4 channels
  • Cable with cigarette plug, 2 meters, 10 amps fused.

Place your order online or visit the store

Have you found what you are looking for and do you want to order the Hitec Astro digital dew controller 4 channels, for example? Then you can do this very easily online. Would you rather see these products in person before buying them? That is also possible with us. You are most welcome in our showroom in Amstelveen from Monday to Friday between 10:00 and 17:00. The showroom is also open on Saturdays, but from 10 a.m. to 4.30 p.m. For more information and advice you can also contact us by phone on 020-6412083. We are happy to help you.

Buying a telescope? This is where you have to watch out | Ganymedes Amstelveen

Buying a telescope? But what exactly should you pay attention to? We’ve compiled everything we know about telescopes for you and are happy to share it with you so you can find and purchase the best telescope for your needs and/or situation.


The market for telescopes is booming! More and more people are getting hooked on stargazing. In the Netherlands, thousands of people practice the hobby of astronomy. Often they are united in amateur associations. Public observatories can be found everywhere in the Netherlands. Most people who have visited a viewing night once become infected with the virus and want to buy a telescope themselves.
The price of telescopes ranges pretty much from 200 euros to 17,000 euros. So there is something for everyone!

As with any investment, you undoubtedly want to weigh the pros and cons. So in this blog we are definitely going to talk about focal lengths, apertures, diameters and eyepieces, but we will also make sure you start asking the right questions of yourself.

Grab a nice cup of coffee and brace yourself to learn all about telescopes. Do you have a little less time? Then jump directly to the topic you want to learn more about via the anchors below!


  1. How does a telescope actually work?
  2. The history of telescopes
  3. What types of telescopes are there?
  4. Terms you need to know
  5. We know, it’s painful, but adjust your expectations
  6. What do you want to go see?
  7. What place do you want to look at?
  8. Indispensable: a good tripod
  9. How to use a telescope
  10. How far can you see with an average quality telescope?
  11. What exactly is astrophotography and which telescope is suitable for it?
  12. Is a spotting scope also a telescope?
  13. Fun to read!
  14. Purchasing a telescope

How does a telescope actually work?

A telescope is an instrument that magnifies objects and/or can gather much more light than our own eyes. Whereas on Earth we use binoculars to magnify objects, we use a telescope for observations in the universe, that is, outside the Earth’s atmosphere. The first telescope even comes from Dutch soil. It was Hans Lippershey who placed two ground lenses in a copper tube, making all the objects you saw through the copper tube seem closer.

But how exactly does it work? If objects are far away then they are smaller and also darker to the point that they reflect so little light that they cannot reach our eyes.

Thus, to see objects from afar we must:

  1. Having as much light as possible;
  2. Magnifying the apparent object

One way to do this is to use lenses. The light rays reflecting off an object reach the object lens, but as a result they also distort and bend toward each other until they reach the focal point. The only problem now is that the image is perceived upside down, oops! Now the second lens comes in handy, namely the one closest to the eye. This ensures that the light rays are straightened, so to speak, before reaching the eye. Incidentally, it actually makes little difference that objects are inverted for deepsky objects and/or planets.

The other factor that matters is the amount of light. The amount of light that can pass through depends on the size of the objective lens. Of course, the size of a lens has its limitations. There are lenses more than a meter in diameter. A good example is the James Webb Space Telescope with a diameter of about 6.5 meters.

However, there is also a downside. So-called refractor telescopes (which thus work with light computation, or refraction) suffer from “lost light. The light that should pass through the lens is actually reflected. So not ideal.

The solution to this is the invention of the reflector telescope. This telescope does not work with Convex (convex) lenses like a refractor telescope, but with concave (concave) mirrors.

 

You still need a large mirror but the advantage is that it is easier to make large concave mirrors than large Convex lenses.
Consequently, the largest reflector telescope has a diameter of 10.4 meters!!! In fact, work is currently underway on a telescope as large as 30 meters in diameter and even larger!!!! Wow.

Every invention is made to get around a problem and make life a lot easier. Does this solve all our problems then? Not quite.

Regardless of the type of telescope you use, there exists the phenomenon of atmospheric distortion. If you look at a star with the naked eye, it appears to twinkle. So not very pleasant. That is why many telescopes are placed at height because the air is much thinner there and the effect is less pronounced.

And even better! You’ve probably heard of the Hubble Space Telescope! That was launched into space, allowing it to capture light rays from stars and planets (virtually) unimpeded. Recently, the James Webb Space Telescope was launched as a successor and/or complement to the Hubble Space Telescope.

And how accurate is this telescope, for example, you may be asking yourself! Well pretty accurate. Think of a firefly in Tokyo that you can observe in New York.

However, there are ways to magnify objects other than optically (the same way our eyes work, i.e., with light).

For example, the Spitzer telescope which works with infrared cameras that detect heat sources in space. The Kepler telescope is an unmanned spacecraft developed by Nasa to detect planets near other stars that may be habitable like Earth. The Kepler spacecraft uses a schmidt camera to study 100,000 stars at once.

Enough theory about telescopes! Let’s take a closer look at telescopes that may be right for you. We’ll walk you through the technical details so you can make an informed decision if you want to buy a telescope.


The history of telescopes

The Dutch are true inventors. The invention of the telescope demonstrates this. It is suspected that it was Hans Lipperhey who was the first to invent the telescope. Lipperhey, from Middelburg, was seemingly in a battle with two other men, namely, Sacharias Jansen and Jacob Adriaanszoon Metius. Lipperhey, however, was the first to file a successful patent application.

Yet there are also stories that Jansen was the first to come up with the idea of a telescope. Indeed, Jansen and Lipperhey were both spectacle grinders and were practically neighbors of each other. Rumor has it that Lipperhey went with Jansen’s invention when the latter traveled to Germany to promote his invention. We will never know exactly.

The Italian inventor Galileo Galilei was the first to come up with an improved version of the telescope, which made it possible to study celestial bodies. What he saw and could observe was at odds with scientific studies of the time. For the first time, dark spots on the sun could be observed, a myriad of stars, and he could see craters and mountains on the moon. His invention and studies are considered the beginning of modern astronomy.

The invention of the telescope is an important moment in human history. Today, the invention of the telescope still has many applications. It is used for maritime, military, scientific and astronomical applications. Prince Maurice of Orange immediately put pressure on his archenemy Ambrogia Spinola with the invention of the telescope. In turn, he responded that from now on he would never be safe because from now on he could be seen from afar.

An important feature of a good invention is that it keeps improving over time. So it was with the invention of the telescope.


What types of telescopes are there?

Lipperhey’s original invention is known as the “Dutch viewer”. However, the Dutch viewer had a limited viewing angle. Johannes Kepler developed a variant in which the viewing angle was much larger. Instead of a concave lens, he used a convex lens.

Another important development is the use of mirrors instead of lenses. Lenses also become heavier and more expensive the larger they are. In fact, lenses must be sharpened on both sides. Another phenomenon is chromatic aberration. This is caused by a property that glass has called “dispersion”. Color shifting is a name that might be a little clearer. In fact, light of different wavelengths is not refracted to the same extent at the surface of lenses.

Mirrors do not have these objections, which is why you also see that all the great telescopes in the world use mirrors.

Today, there are three types of telescopes, namely:


Terms you need to know

Aperture/diameter of the lens

This is an important feature you want to look for when buying a telescope. The diameter determines how much light is captured, the maximum resolution and thus the maximum useful magnification (see below). Available diameters can be found from 50mm to 356mm.

Focal length

The focal length is the distance light must travel to converge into a single point (the focal point). The focal length is an important number for telescopes. Partly because of the focal point, the magnification of a telescope is determined. In practice, you will find focal lengths from 250mm to 3910mm.

Many times on a telescope you will find the following D=102 mm F=1000 mm depending of course on the aperture and focal length.

Aperture / focal ratio

You find this number by dividing the focal length by the diameter (aperture). Practical ratios are 2 to 15. This number (f) indicates the speed of the device.

Minimum sensible magnification (x)

The size of a human pupil varies between 2 and 7mm. This maximum is used in calculating the minimum sensible magnification. You do this by dividing the diameter/aperture by 7 (maximum pupil size). It ranges from 1 to 50.

Maximum sensible magnification (x)

This is the magnification limit. It is approximately 2.34 times the aperture/diameter. The maximum is about 840 for available telescopes with an aperture of 356mm. Keep in mind the limits of our seeing, often magnification of more than 300 is not useful because the atmosphere through which we are looking is cloudy.

Maximum resolution

It can be calculated by dividing arcsec by the number of pixels. An arcsec is a number corresponding to 1/60. Practically, this is expressed as a grade 1 through 3. Resolution is important in relation to distinctiveness. High distinctiveness can distinguish 2 stars that are close to each other while with low distinctiveness it is perceived as 1 star.

Boundary magnitude

This is a somewhat theoretical figure. If you assume that a star with magnitude 6 is still clearly visible to the naked eye, then you can calculate the limiting magnitude as follows: 6+5x log (d). It is expressed in centimeters. The limiting magnitude for our telescopes is a maximum of 15.

Coatings

A coating increases light transmission. A coating is applied to the front correction plate and can provide up to 15% more light transmission. We know the following coatings: Starbright XLT, Fully-coated, STN-coated and Fully-multi-coated.

Telescope type

The first telescopes invented in the Netherlands were refractor telescopes. These telescopes work with refraction of light. Another word for refraction of light is refraction. Hence, these telescopes are called refractor telescopes. Refractor telescopes are still very popular for the consumer market.

Reflector telescopes use mostly convex mirrors. The major advantage over lenses is that mirrors do not suffer from color shifting due to the non-uniform refraction of light. In addition, as lenses become larger, they therefore also become much heavier and more expensive.

Then we also have Schmidt-Cassegrain telescopes. A beautiful name but what exactly is it? These are called Catadioptric telescopes. These use both lenses and mirrors. Light collection here is done by a mirror but a lens is also placed in the front of the viewer to eliminate image errors.

Then we have the Maksutov telescopes. These are telescopes with both mirrors and lenses.
It combines a mirror with a weakly negative meniscus lens. A meniscus lens is a lens with a convex and a concave side (i.e., both a convex and concave lens).
Maksutov you often see in Cassegrain variants hence the name Maksutov-Cassegrain telescopes.

In conclusion. There are particularly many telescope variants. Throughout the telescope’s rich history, designers have tried to correct errors and adverse effects. Today for consumer telescopes, telescope manufacturers naturally look at the manufacturing process and related costs.

Type of optics

We have already talked about mirrors and lenses. Looking further into lenses, a number of lens systems can be distinguished. For example, achromatic. Here the fire distance is equal at at least two wavelengths. The systems are designed to counteract adverse effects such as chromatic and spherical aberration.

In telescopes, you see 2-fold or even 3-fold variants (doublet / triplet).

Eyepiece

The eyepiece helps determine not only the magnification, but also the quality of the image. It goes somewhat in concert with optics of the telescope. To explain it easily, I will give the example of a stereo system. You can have a very good amplifier, but if the speakers are nothing you won’t get out of it what’s in it. And vice versa, the same is true. Are the speakers outstanding, but the clock radio is the amplifier, it will never be much. In this example, the speakers are the eyepieces. However, buying better eyepieces always gives an improvement in your image. And because the standard eyepiece size these days is 31.7 mm (1.25″), which is the diameter of the sleeve of the eyepiece that goes into the diagonal, you can always use the eyepiece again on another telescope. They used to use 24.5 mm (0.96″) eyepieces and now the 50.8 mm (2″ ) are on the rise. Standard with most telescope sets is 31.7 mm eyepieces. These are standard eyepieces, so in most cases there are still gains to be made here. It is also desirable to have multiple eyepieces so that you can easily search at the lowest magnification by having a larger field of view. If you have found the object then you can use another eyepiece for stronger magnification.

Field of view

The field of view of a telescope is partly determined by the focal point of a telescope, the longer the focal point the narrower/smaller the field of view is. In binoculars, for example, it often says 123 m/1000 m. This means that at 1000 meters away you have a field of view 123 meters wide. For binoculars, this is expressed in degrees. In stargazing it is less so, but because we are looking over a longer distance we can have the moon fully in view at reasonable magnification. Here it will be about 1 degree.

Diagonal

The diagonal is most commonly used with a lens system and Schmidt-Cassegrain system. With these telescopes, you look at the back of the telescope and it is desirable to be able to look into it from above. The diagonal comes in 45 degrees and 90 degrees. With a Newton system, you always look from the side of the telescope and do not need a diagonal. A telescope set usually includes a 90-degree diagonal. This sets the image straight, only left and right are swapped. In some telescope sets, this has also been adjusted. However, this is done with a prism and it often produces some loss in your image.

Mount

With mounts, you see roughly 2 forms, azimuthal and equatorial. Azimutal mounts you can move horizontally and vertically. Equatorial designs have the advantage that it always rotates with the pole star, requiring only 1 movement to track an object (e.g., a star). For performing astrophotography, an equatorial is generally the best choice.

Focuser type

These are the systems that are used. A well-known and widely used system is rack and pinion where a gear moves in a linear gear. The Crayford focuser is a more advanced system which works with a spring-loaded shaft that holds the focus tube opposite bearings and controls its movement.

Focuser size

Found in varieties from 1.25 inches to 3.5 inches. You’ll find the larger ones on the more expensive variants.

Tube material

The material of which the (sleeve of the) telescope is made. Each material has different characteristics in terms of hardness and robustness. The casing is made of such materials as aluminum, steel, plastic and carbon.

Seeing

Seeing is a concept that as you get further into the field, and talk to other amateurs, is something they always complain about. The seeing, or to throw in a fancy term astronomical vision, is term used in astronomy for the influence (blur, “twinkling”) of atmospheric disturbances (turbulence) on vision through telescopes. Visibility is one of the biggest problems in astronomical observations from Earth.

We tried to talk about the principles of stargazing in our own terms, as we at Ganymedes educate someone about a telescope. There are many other aspects to consider. In another blog, we will discuss in detail the topic of astrophotography.

Actually, it is wise to purchase the first telescope from a company or store where you can see and “feel” the telescope, and where you are actually explained how it works. Get informed and realize what kind of instrument you are bringing into the house. Most telescopes are on a tripod, and this is larger in reality than you can see in a photograph anyway. Also, most telescopes are easy to take apart and store, often in 3 main parts: tripod, mount and telescope.

There are a legion of models available on the market, of any brand at various toy stores or online bookstores. However, there is much, if not a lot of “junk” among them. Don’t be tempted by buying a toy telescope for little money. In that case, buy binoculars so they can at least explore the sky. With a toy telescope you ruin interest more than you generate it. You can see in our store what is cheap, we recommend this, but you can also see what you are buying something with for many fun evenings of viewing pleasure.

I hope that from this text you have become a little wiser in the matter of stargazing, and that you dare to take the step to explore the untold vast night sky. We, Jeroen, Peter and Paul, are here to help you get started. It takes a lot of patience and perseverance, but in return you get something special.


We know, it’s painful, but adjust your expectations

You’ve probably already fantasized what it would be like to see the wonderful world of the universe in detail. Perhaps also made a little crazy by images from the Hubble telescope, among others, you may have gone exploring and made the decision to buy a telescope.

But in all honesty, if you expect this then you will probably come out cold. And fair is fair. Can you expect to match Hublle’s quality with your home telescope? No, you can’t. So be realistic and know what you want to look at. Thus, you will also always purchase the right scope for your situation.


What do you want to go see?

Decide in advance what you want to do. Roughly speaking, there is a distinction between visual astronomy or photographic astronomy(astrophotography).

If you want to observe visually you should do it at night. At night, however, our eyes work differently and are barely able to perceive colors. The telescopes that take the beautiful pictures also have a much larger aperture than our eyes. Photographs also use very long exposure times while your eyes can transmit the light of the moment to your brain. So if you want to observe directly visually, you will mostly see no more than spots of light. But if this is all, is it for me I hear you say! We think so because there is still a lot of beauty to admire. For example, the moon with all the beautiful details that you can’t stop looking at. With a good telescope of several hundred euros, you can also look at planets. After all, you also need a lens with higher magnifications. For deep sky objects, you do need an instrument large enough for these observations. But the biggest problem for good observations is light pollution. After all, it should be as dark as possible. Nevertheless, it is definitely possible to observe other galaxies with your own eyes, this is tremendously cool, right?

With photographic observations, you can expect much more in terms of quality and visible detail. However, these telescopes are also more expensive to buy and you have to exercise some patience to arrive at a nice picture. If you have a system that can track an object you can enter the location of the object on the computer after aligning the mount and then you can enjoy a cup of coffee while the system does its job.

In short: there is plenty to experience and see but above all, know exactly what you want to look at and for what purpose you are going to buy a telescope.


What place do you want to look at?

As mentioned, we need a dark night sky to make the best possible observations. But where do you find those places where it’s dark? Places where you can observe are called observatories. The Netherlands has some good locations for stargazing. The Netherlands also has 2 real dark-sky parks, namely the Lauwersmeer National Park and Boschplaat on Terschelling. Furthermore, it is still really good dark on the black rooster in Friesland, dark moors in Drenthe, the dirty hole in South Holland, the sandy plains of the Veluwe, the Maas dunes in Limburg and the beaches of Zeeland.

A nice website with the most beautiful spots can be found on Outdoorinspiration. Outside the Netherlands famous and unique places are for example the Mauna Kea Observatory – Hawaii, Observatorio del Roque de los Muchachos – La Palma (Spain), Observatoire du Pic du Midi de Bigorre (France) and Observatorio Cerro Mamalluca (Chile).


Indispensable: a good tripod

A good tripod is indispensable if you want to purchase a telescope. A solid tripod ensures that your expensive telescope will not come off the tripod and thus can be damaged. In addition, a relatively slightly heavier tripod also protects against wind gusts causing your telescope to topple over. Of course, a tripod also ensures that your camera does not move unnaturally and therefore interfere with observation.

We sell unloading tripods from Celestron, iOptron, ZWO, Benro and other brands.


How do you use a telescope?

For someone just starting out in the hobby, perhaps the most important question. Therefore, in collaboration with Sterrenkijken.nu, we have created this handy video full of tips & tricks.


How far can you see with an average quality telescope?

This is a question that is actually not very relevant, in that higher magnification does not always mean better. So more is not always better. What matters, of course, is the quality that can be achieved with a given magnification.

To give an idea of what, for example, the Hubble telescope can do. This telescope is capable of observing a Tokyo firefly in New York. You’re talking about a distance of more than 10,000 kilometers. So that’s pretty impressive.

But we don’t have a Hubble telescope, of course. So therefore something more practical. You can view the moon, sun, planets and various nebulae or galaxies with a medium-quality telescope. So…plenty to observe we think!


What exactly is astrophotography and which telescope is suitable for it?

We have already explained that with a cultivation scope you can observe visually or photographically. Because photographic observations require different requirements, there are special astrophotography telescopes on the market. So astrophotography is actually a specialty within photography that focuses on objects in the (nighttime) night sky.

In any case, you need a telescope that supports an astrophotography camera and the necessary accessories such as filter sets, adapters, filter holders, guidescopes and more.

In any case, be well informed if you want to start astrophotography.


Is a spotting scope also a telescope?

Yes. They are just a lot handier and thus suitable for on-site use. It is therefore widely used by birders to see birds in even better detail. Spotting scopes can also be used in penthouses to see even more of the surroundings or high in the mountains to explore the area. Spotting scopes are available in the range of several hundred dollars to several thousand dollars.


Fun to read!

There are lots of great websites about telescopes and astrophotography. There is a lot of information on the websites of observatories. In the Netherlands there are also many public observatories that organize, for example, evenings where you can watch and ask questions. There are also universities that open their observatories and, of course, can share a lot of information.

The European Southern Observatory (ESO) is the European organization for astronomical research in the southern hemisphere.

In the Netherlands, you also have many museums and planetariums that focus on astronomy.

More info and various links can be found, for example, on the KNVWS website.


Buying a telescope at Ganymedes

Ganymedes has the largest collection of stargazers/telescopes in the Netherlands. Think stargazers from:

To make the choice even easier, we have created a roadmap to purchase the right telescope.
It is important to consider the following.

Your budget

Stargazers can be quite pricey. Therefore, set in advance a maximum amount you want to spend on stargazing. For the beginner, an off-the-shelf telescope is recommended. There is no need to purchase additional accessories for this, which means you can get started on your new hobby right away.

Excellent telescopes with which to start your new hobby are the Celestron AstroMaster telescopes or telescopes from the Celestron StarSense Explorer series.

The tripod and mount

Much more important than is often assumed are the tripod and mount of telescopes. After all, the heavier a telescope is the more solidly it must be shored up by a stable mount and tripod. Again, there are several variations to choose from. Ideally, a thick tripod with a sturdy tripod and a heavy-duty mount. But this is where the budget comes into play again: such a solution for stargazing is on the expensive side.

The following variants are present. An azimuthal (parallactic) mount. An Azimuthal mount does nothing but move left and right and up or down. There are several variants in this, the ordinary hand-held one, possibly a computer-controlled one such as the Celestron NexStar SLT, SE or CPC series. There are also the Dobson series telescopes. Which are mostly praised for their value for money. You get a lot of aperture, it’s a Newton system telescope, azimuthal tripod. However, tracking with such a system is not something for beginners. It is excellent for quickly viewing many objects.

A parallactic/equatorial mount also has 2 axes over which to rotate. But a parallactic/equatorial mount can be adjusted to the latitude of the earth. For the Netherlands, that ranges roughly from 51 to 53 degrees. 51 degrees for Maastricht and 53 for Groningen. We usually suggest adjusting it to 52 degrees. You can now track about 1 axis and follow the correct trajectory that moon and planets also follow or all the other objects in our night sky. These mounts used to have fine motion knobs that allowed you to keep tracking the object so very fine. Today, these mounts are equipped with computer control. Using the date, time and coordinates, the position is determined and an alignment on, say, 2 stars makes the mount know where it is. The 40,000+ objects available makes it possible to see a lot in an evening.

Telescope type

Broadly speaking, there are three types of telescopes. First, there is the Newton system, which is also called reflector or mirror telescope. In addition, you have the lens system or refractor. And finally, there is the Schmidt-Cassegrain system. Which system is best to choose depends on what you are interested in. A lens system is great if you want to study the moon and planets. For deepsky objects, a Newton system or even a Schmidt-Cassegrain system is more useful. Keep in mind that “different rules” apply to astrophotography, these are explained in more detail in our blog on astrophotography.

As with many things, there are advantages and disadvantages with each telescope type. The most important are:

Newton system:

Benefits:

  • Larger aperture vs. lens system.
  • No problems with color errors.
  • Relatively cheaper because the opening is larger.
  • Well suited for deepsky objects such as nebulae.

Disadvantages:

  • Cooling time of the main mirror.
  • Collimation of catch mirror relative to main mirror.
  • Obstruction in the light path, capture mirror suspension.
  • Less suitable for moon and planets.

Lens system:

Benefits:

  • Full opening and therefore no interference in the light path.
  • Sharp and high-contrast images.
  • Little to no cooling time.
  • Well suited for moon and planets.

Disadvantages:

  • Smaller aperture compared to the newton or Schmidt-Cassegrain system.
  • Color error in the lens, unless the lens is made of more expensive optics.
  • Relatively more expensive because of the smaller openings.
  • Less suitable for deepsky objects (in the case of visual use).


Schmidt-Cassegrain system

Benefits:

  • Relatively compact construction while focal point is long.
  • No problems with color errors.
  • Very many expansion possibilities.
  • Smaller versions easy to take with you when traveling.
  • Well suited for moon and planets as well as deepsky objects.

Disadvantages:

  • Longer cooling time due to closed mirror system.
  • Collimation of catch mirror relative to main mirror.
  • Obstruction in light road.
  • Mirror flop, although that was more of an issue in earlier times.

Telescope aperture

The aperture size of telescopes determines how much you can see. This is because a larger aperture captures more light, making the image brighter and allowing you to discern more details. A small aperture is suitable for viewing the moon and planets; a large one for deepsky objects.

We hope that with this information you will at least be better able to ask the right questions so that you have gotten an idea of what is possible.

We also understand if you still have questions. So feel free to stop by our store in Amstelveen. Our staff is ready with advice and assistance!

Already looking at all our telescopes? Have fun!