EXCERPT page containing first few paragraphs. 2019-02-17 17:09:15
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Sigma supplies MTF only for f/1.4 and only at 10 and 30 line pairs per millimeter, which is odd in the year 2019 where digital cameras like the Nikon D850 hit 116 lp/mm. Zeiss uses 10/20/40 lp/mm, which is better, but still low compared to camera requirements. Setting that aside, the MTF looks fabulous, though it is lower at f/1.4 than the MTF of the Sigma 40mm f/1.4 DG HSM Art—28mm is a more challenging focal length than 40mm.
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