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SHOOTOUT: Leica SL2 vs Panasonic S1R Sharpness with M-Mount Lenses: Piper Mountain Wilderness

re: Field Curvature for Zeiss ZM 35/1.4 Distagon, Mirrorless Cameras vs M-Cameras
re: MTF on Mirrorless Cameras, Sensor Cover Glass

The issue: ray angle interacts with the sensor cover glass thickness; a lens is designed assuming a specific thickness. Deviations from that thickness degrades optical performance, particularly off-center. A secondary issue is color shading, along with accentuated field curvature and astigmatism.

One would hope that the L-Mount alliance would have standardized on sensor cover glass thickness and characteristics, so that lenses of either brand could be used with the same results on either-brand camera. But in marketing, form trumps function.

Definitive finding for M-Mount lenses

This shootout between the Leica SL2 and the Panasonic S1R is definitive in proving major image quality differences between the SL2/S1R for M-mount rangefinder lenses, including sharpness and color shading and field curvature.

SHOOTOUT: Leica SL2 vs Panasonic S1R Sharpness with M-Mount Lenses: Piper Mountain Wilderness

Includes images up to full camera resolution from f/2 through f/8, plus crops.

Piper Mountain Wilderness abutting Death Valley Road
f1.4 @ 1/6400 sec electronic shutter, ISO 100; 2021-09-18 12:24:03
LEICA SL2 + Zeiss ZM 35mm f/1.4 Distagon
ENV: Piper Mountain Wilderness, altitude 5600 ft / 1707 m, 70°F / 21°C
RAW: vignetting corrected, pull 0.17 stops, +10 Whites, +10 Clarity

[low-res image for bot]

Roy P writes:

Not in the least surprised – this is the kind of garbage I got from the S1R using M lenses, which is why I returned the S1R to B&H, following my 3-day trip to Alabama Hills. Some of the multi-shot high-res images were also quite hideous. Stopping down to f/5.6 on the Zeiss 35/1.4 ZM and Leica 50/2 APO were not bad, but still, just not satisfactory.

TW, the guy who used to make the kit for the 6-bit coding no longer makes them. Any other way to fool the SL2 with a non-Leica lens? Maybe just hand-paint a pattern on the lens?!

DIGLLOYD: coder kit for M lenses is no longer made. You'll have to set the lens coding manually.

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