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Forum: Optics Theory - 02-06-2019
Replies: 57
Views: 3,210
Posted By ph.
My first associative response was to recall the...

My first associative response was to recall the ancient Kilfitt 90mm macro which had an element with two radii.

My second was to recall the last LeicaR 35-70 which had a "secret" aspherical element...
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