EXCERPT page containing first few paragraphs. 2019-09-18 20:07:43
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MTF wide open shows world-class contrast in the center, declining steady and gracefully across the frame (which is at least partly a mild field curvature).
In the central 1/3 or so, performance is already near-optimal wide open at f/2.8. Peak performance is nearly reached by f/4, but f/5.6 smooths out the field, which has some field curvature (focusing closer at the periphery than the center aka “forward field curvature”).
The use of f/8 will deliver a bit more depth of field, but it does not improve upon the outstanding quality at f/5.6; it actually declines a little overall from diffraction. Similarly, f/11 dulls the image significantly over f/8 (compare f/8 to f/11 and see all curves drop). However, the use of diffraction-mitigating sharpening for f/11 can yield images as good as f/8 (or very nearly so), but increased depth of field; see Mitigating Micro Contrast Losses from Diffraction Blur. That extra depth of field can matter little or matter signficantly; see the crops in the Orange Tree Trunks example.
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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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