EXCERPT page containing first few paragraphs. 2019-12-09 21:56:10
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On my Leica M9P, the 21mm f/3.4 Super-Elmar-M had a persistent cyan cast in the lower left corner (in landscape orientation). Always the same corner, which means top left or bottom right for vertical shots, depending on how I held the camera.
The issue shows up as green/cyan in the lower left corner. Leica’s commentary follows after the examples below.
Color shading and lens correction on the M9
Color shading is a fact of life with M lenses: the steep ray angles of M lenses cause an interaction with the infrared-blocking glass over the sensor, causing a shift to cyan towards the corners, increasing as the corners are approached.
The M9’s firmware is supposed to correct it evenly for 6-bit coded Leica lenses. So one must conclude that either the lens I shot is outside the normal range, or that the lens profile in the camera firmware is just plain wrong.
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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, Leica SL.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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