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Gordon Rayner
scholastic sledgehammer
Reged: 03/24/07
Posts: 970
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Re: ED glass in binoculars
07/02/09 04:31 PM
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In #3194486, , we read " ..... often the CA correction in a doublet is corrected at the 70% position off axis..."
It has been a while since I read about lens design, but I am recalling that the 70% is at the ray height 70% of the lens radius, and is for rays parallel to the lens axis, called paraxial, and is not a correction chosen for field rays.
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