EXCERPT page containing first few paragraphs. 2021-04-13 02:56:29
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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, Leica SL.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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