EXCERPT page containing first few paragraphs. 2021-01-25 09:45:41
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Panasonic S1R firmware version 1.0, Leica 75/2 APO firmware version 1.0.
This extensive series demonstrates an electro-mechanical focus shift behavior with the Leica 75mm f/2 APO-Summicron-SL ASPH when used on the Panasonic S1R. I was able to reproduce this problem at will once I understood the behavior (following huge frustration in so many damaged images).
The behavior here is the same as seen with the Leica 90mm f/2 APO-Summicron-SL ASPH. The problem likely afflicts most or all Leica SL lenses. Please see additional commentary on that page, as it applies both to the 75mm and 90mm and most likely other Leica SL lenses.
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