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EXCERPT page containing first few paragraphs. 2023-02-08 01:59:32

Leica 35mm f/2 APO-Summicron-M ASPH

MTF for Leica 35mm f/2 APO-Summicron-M ASPH

The MTF chart shows that f/2.8 bumps things up to likely peak performance (but f/4 is not provided), and that f/5.6 provides nice consistent performance across the field at the cost of lowered contrast on coarse, medium, fine structures. In other words, f/4 is almost certainly the optimal aperture for practical reasons (focus accuracy, field curvature, etc).

The field has some mid-zone field curvature, which the MTF chart almost certainly under-emphasizes. It is readily apparent at f/2.8. It is likely to be a consideration for optimal focus with real field shooting, particularly for distance scenes. Leica’s MTF charts have proven themselves to be in adequate vs real field behavior as the 50/2 APO demonstrates in spades.

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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.

Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.

  • Make better images by learning how to get the best results right away.
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  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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Aperture series 2,2.8,5.6 available in full article
MTF for Leica 35mm f/2 APO-Summicron-M ASPH

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