EXCERPT page containing first few paragraphs. 2023-12-08 02:31:03
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A great MTF chart is just that— a chart of maximum achievable performance if a lens is built with exacting tolerances. That doesn’t happen, except perhaps for the military or lenses costing $30K each for Hollywood.
Real lenses have to be built, and it is frequently the case that manufacturing errors produce lenses which perform well below what the MTF chart would suggest, including prominent blur in one or more corners or along an edge, as we shall see here.
This X100 sample was the 3rd of three samples I tested. Of those, 2 of 3 showed blur on one side of the frame. However, depending on the zone of focus, it won’t always be obvious, can vary by focus distance, and is thus easily missed by some users (who will therefore insist their X100 is free of the issue). In fact, I had to shoot a a variety of frames to produce this clear-cut and obvious 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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