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EXCERPT page containing first few paragraphs. 2019-10-28 23:59:37

47MP Panasonic S1R
Leica 90mm f/2 APO-Summicron-SL ASPH

Unstable Focus: Orange Pine Tree Trunk

Panasonic S1R firmware version 1.0, Leica 90/2 APO firmware version 1.0.

This extensive series demonstrates an electro-mechanical focus shift behavior with the Leica 90mm 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).

This behavior damaged many images, costing me considerable time and effort and causing world-class optics to render mediocre results with stopped-down performance inferior to wide open performance. The lens is very very sharp (as good as it gets), but in Multi-Shot High-Res mode, the right things are less sharp than intended, and the wrong things are more sharp than intended—extremely damaging in high-res mode with some subjects.

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