apochromatic system

apochromatic system

[¦ap·ə·krō¦mad·ik ′sis·təm]
(optics)
An optical system which is free from both spherical and chromatic aberration for two or more colors.
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The result was an apochromatic system with a 5 [degrees]-by-30 [degrees] field of view - nearly 50 times wider than the conventional Schmidt but still yielding razor-sharp star images from edge to edge.