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EXCERPT page containing first few paragraphs. 2023-03-21 17:21:47

Color Shading for M-Mount lenses on Leica M9

See the Color Shading general discussion as well as the table of ray angles.

This page offers color shading aperture series for a selection of M-mount lenses: Leica M, Zeiss ZM, Voigtlander on the Leica M9P (same as M9), with firmware 1.176 (Jan 2012).

Color shift and uniformity

Shown is the color uniformity across the aperture range for each lens— “color shading”or in a sense, “color vignetting”. The effect is caused by interaction with the sensor cover glass over the digital sensor and it is the ray angle from the exit pupil which is most responsible.

Since M-mount lenses were nearly all designed with film-era bodies in mind (some incorporate a few tweaks for current digital), we can expect that color shading due to ray angle will be an issue, with wider angles exhibiting more of an issue, and faster lenses also having more trouble at the first aperture or two.

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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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  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
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