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Zeiss ZM 35mm f/1.4 Distagon
Leica M Monochrom Typ 246

Aperture Series to Assess Diffraction and Digital Artifacts (Dolls)

This aperture series assesses diffraction on the 24-megapixel Leica M Monochrom Typ 246 using the Leica 50mm f/2 APO-Summicron-M ASPH, a very high performer.

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.

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