EXCERPT page containing first few paragraphs. 2017-11-22 23:37:03
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Lens coding enables the Leica M Typ 240 to determine which lens is mounted and thus to apply color shading and vignetting corrections.
Without coding, off-center vignetting and color casts increase, and this gets ugly with wide angle lenses. Nor does Leica offer any solution for correcting a DNG file that failed to be properly coded.
Using a brand-new Leica M Typ 240, the camera repeatedly failed in reading the lens codings in a brand-new 50mm f/2 APO Summicron as well as several other lenses. It might have something to do with an unusually tight lens mount (as compared to the M9P).
Why does not Leica offer a fix?
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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 and Leica S.
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.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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