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EXCERPT page containing first few paragraphs. 2023-02-08 02:33:13

Leica 50mm f/1.2 Noctilux-M ASPH

MTF for Leica 50mm f/1.2 Noctilux-M ASPH

Leica supplies MTF for f/1.3 (not f/1.2)... is it a typo or is it actually f/1.3?

Leica supplies fantasy MTF for its lenses. That is, the MTF is computed (not measured) based on a computer model, not a real lens. Moreover the data is not corrected for the ray angle effects of a digital sensor. Accordingly, real MTF is unlikely to be as good as Leica presents, particularly at wider apertures.

At f/1.3, MTF of the Leica 50mm f/1.2 Noctilux-M ASPH shows reasonably strong contrast for coarse structures but with field curvature showing a large dip not far away from center. Medium size structures have very modest (poor) definition with a wild variation presumably due to field curvature. Fine details effectively do not exist at f/1.3.

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Aperture series 1.3,2.8,5.6 available in full article
MTF @ 5/10/20/40 line pairs/mm for Leica 50mm f/1.2 Noctilux-M ASPH

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