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Old 02-05-2019   #30
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Originally Posted by jarski View Post
Now, what is APO then, in layman's terms?
The full term is "apochromatic." It means that the three primary colors, red, green and blue, all come to a focus in the same plane. A non-APO lens might typically bring only two of three primaries (such as blue and green) into sharp focus at the film or sensor plane.
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