Achromat

Achromat

An achromat or an achromatic lens system is understood to mean a lens system in which the focal length is the same at at least two wavelengths. This reduces the effects of chromatic aberration and spherical aberration.

The most common type of achromat is the achromatic doublet , which consists of two lens components that exhibit dispersion (color fringing) to different degrees.

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Usually one component is hollow (concave) and made of flint glass, and the other is convex (convex) and made of crown glass. Of the two, crown glass has the lowest dispersion.

Other low dispersion glasses can also be used for this. Both lens components were mounted close together, usually even glued together; together they are designed so that the chromatic aberration of one compensates for that of the other.

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