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process lens

A lens that is symmetrical and designed to work between 1:1 and about 4:1. It covers a field of about ±20° at f/8 or f/10, and may have a focal length up to about 30 in., although the usual focal length is 18 in. The best process lenses are apochromatic, meaning that three colors have been brought to a common focus instead of the usual two.
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