achromat

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Related to achromats: Achromatic doublet

achromat

(ˈækrəˌmæt)
n
1. (General Physics) Also called: achromatic lens a lens designed to bring light of two chosen wavelengths to the same focal point, thus reducing chromatic aberration. Compare apochromat
2. (Medicine) a person who has no colour vision at all and can distinguish only black, white, and grey. The condition is very rare
References in periodicals archive ?
Like all fast achromats, the Infinity 90 shows violet halos around the Moon and planets, but the planetary views are otherwise quite attractive and detailed.
Lower-powered microscope objectives can be of moderate quality, such as achromats, as lower magnifications are typically used.
The sun blinds people with achromatopsia, known as achromats, when they are outside, and some people are so sensitive to light that they are even uncomfortable indoors in a normally lit room.
Lenses are limited by the inherent diffraction efficiency of the aspheric surface, so they yield a lower overall transmission than comparable aspherized achromats.
DayStar recommends using achromats or apochomatic refractors without additional correcting elements near the focuser.
Achromats, the most inexpensive models, produce a bluish-purple halo of unfocused light around bright subjects such as the Moon and planets.
Company specializes in custom manufacturing of precision lenses, prisms, achromats, windows, mirrors, and filters.
These include a pair of D&G Optical 5-inch f/30 achromats in oversized tubes that are intended primarily for solar observing.
Fast, short-tube achromats are very compact (so are nice travel scopes) and are best for wide-field deep-sky viewing.
That $20 telescope fired her imagination, just as many other lowly 50-mm achromats have done for others (I still fondly remember my first 50-mm Tasco).
Achromats eliminate the worst of the false color, but they still show violet fringes around bright objects.
Thankfully, you don't need an expensive apochromatic objective lens either, since the chromatic aberration inherent in short-focus achromats isn't noticeable at the low magnifications typical of RFTs.