apochromat

(redirected from Apochromatic doublet)
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apochromat

(ˌæpəˈkrəʊmæt) or

apochromatic lens

n
(General Physics) a lens, consisting of three or more elements of different types of glass, that is designed to bring light of three colours to the same focal point, thus reducing its chromatic aberration. Compare achromat
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The new 80-millimeter f/6 achromat ($379) and 66-mm f/6 ED apochromatic doublet ($329) include features not normally found at these prices, such as a dual-speed Crayford-style focuser and a custom-fitted, foam-lined case.