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Leica 75mm f/2 APO-Summicron-SL ASPH: Focus Instability

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My review of the Leica 90mm f/2 APO-Summicron-SL ASPH and Leica 75mm f/2 APO-Summicron-SL ASPH were severely impacted by a problem which I document in this analysis. It was very confusing, and cost me irreplaceable time and effort to diagnose, damaging hundreds of my images and forcing me to shoot and reshoot with the same crappy results until I worked out an imperfect work-around. I first noted the issue in Leica 90mm f/2 APO-Summicron-SL Aperture Series: Mosaic, Focus Shift.

This series confirms that the Leica 75mm f/2 APO-Summicron-SL ASPH shares exactly the same problem as the Leica 90mm f/2 APO-Summicron-SL ASPH.

In L-Mount mirrorless:

Leica 75mm f/2 APO-Summicron-SL ASPH: Unstable Focus: Pine Tree Trunk

Anyone using Leica SL lenses would be well advised to read this piece. I suspect that it affects all or at least most Leica SL lenses.

Below, two frames at f/2. The lens focus was not changed by me. This behavior can be reproduced at-will.

Crops from 93 megapixel images
f2 @ 1/250 sec Multi-Shot HighRes, ISO 50; 2019-06-08 14:37:53
Panasonic S1R + Leica APO-Summicron-SL 75mm f/2 ASPH RAW: Enhance Details

[low-res image for bot]

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