apochromat

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Related to apochromats: apochromatic objective

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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References in periodicals archive ?
Even the best apochromats may have some color artifacts visible on out-of-focus star images that veil the diffraction patterns.
Apochromats provide the best possible performance per unit of aperture, and are also ideal for astrophotography.
Apochromats are free of the halo issue, but big ones are extremely expensive.
And short-focus apochromats are by far the most popular instruments for wide-field astrophotography.
These apochromats feature a 3-inch-diameter rear element to minimize light drop-off across a 50-millimeter-diameter image circle.