EXCERPT page containing first few paragraphs. 2019-02-21 01:00:35
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That central rearward focus shift results in blurry disappointment is readily apparent in each of those series, with a loss of sharpness over central areas of the subject at f/2 and f/2.8 which is regained only at f/4. This pronounced focus shit [sic] is problematic for many types of shooting, particularly for conventional DSLR focusing with its optical system independent of the lens*. Thus I have mixed feelings about the Sigma 40mm f/1.4 DG HSM Art; it is capable of outstanding results and yet the central rearward focus shift makes it a chore to work with (peripheral areas are stable, holding focus well).
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