EXCERPT page containing first few paragraphs. 2017-03-25 00:56:57
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Past experience with the Leica M Typ 240 (Bayer matrix color sensor) shows that the first hints of diffraction appear at f/8, with 9.5 still holding good quality but showing some dulling. Obvious dulling (loss of micro contrast) is occurring by ƒ/11 and substantial losses are seen at f/16.
The 24-megapixel Leica M Typ 246 can be expected to suffer at least as much from diffraction, and probably a bit more, perhaps 1/2 stop earlier, since its sensor needs no demosaicing and thus has inherently higher spatial resolution.
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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.