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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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Since 2009, Diglloyd Guide to Leica is the authoritative review and reference for Leica M lenses: Leica M, Zeiss ZM, Voigtlander, as well as Leica M digital bodies. Leica S is also included.
It includes hundreds of pages of exclusive coverage and high resolution Retina-grade examples covering Leica M-System lenses and digital bodies with in-depth performance comparisons and analysis.