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achromatic

(1) Free from chromatic aberration. An achromatic lens is able to transmit light without separating it into colors. (2) Achromatic color is distinguished by differences in its lightness. It has no hue, like black, white and shades of gray.

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achromatic

lens system that has been corrected for chromatic aberration.
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achromatic

A subject, scene, or Image without color.
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