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Mysterious ring inside the lens
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Home   Manual Focus Lenses
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PostPosted: Tue Mar 31, 2015 4:43 am    Post subject: Reply with quote
On a Schneider Kreuznach lens I tested to remove this. As I remember it was on a glass plate, and with this removed the optical setup was wrong - as expected. Glass or plastic inside the optical path at least changes the distances.

I want to test it more, but have to find the lens again.
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