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Old 02-06-2019   #35
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ph. is offline
Join Date: Sep 2014
Posts: 88
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 in the sense that no advertising bothered to mention it.

In the first case concentric rings can be observed, in the second, no particular peculiarities.

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