EXCERPT page containing first few paragraphs. 2023-03-21 17:05:31
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Vignetting: 18/3.8 Super-Elmar-M ASPH
Vignetting is about what one would expect, meaning that natural vignettting remains significant even after the lens has done its job (cos^4 law, reflection off the sensor, etc).
Fortunately, the M9 lens correction moderates most of the vignetting so that it goes without notice on most images.
Since the 18/3.8 SEM was originally released with 6-bit coding, tricking the M9 into using the 18/3.8 SEM lens correction entails coding the alternate lens so as to trick the M9 into applying lens correction (e.g., the Zeiss ZM 18mm f/4 Distagon).
See also the Color Shading page.
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Diglloyd Guide to LEICA contains in-depth coverage of Leica M system cameras and lenses, with additional coverage of Leica M Monochrom, Leica Q.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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