EXCERPT page containing first few paragraphs. 2022-07-05 02:09:01
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The MTF chart shows that f/4 bumps things up only a little, with f/2 already better than most lenses can do at any aperture.
The field is flat (no meaningful field curvature) and there looks to be no focus shift.
In absolute terms this MTF is spectacularly good. In relative terms, few lenses can compare, one exception being the Leica 35mm f/2 APO-Summicron-M ASPH, assuming the MTF charts can be compared (maybe, Leica is computed MTF, whether Voigtlander measures or computes MTF is unspecified).
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
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- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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