EXCERPT page containing first few paragraphs. 2020-09-19 11:35:21
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Optical vignetting is moderate at about two stops wide open (to the extreme corners).
What counts on a digital sensor are ray angle effects (natural vignetting) which can darken peripheral areas over and above optical factors; field images suggest that the lens is unusually friendly to the sensor in this regard, and thus the total realized vignetting is held to a level that is excellent for a 24mm f/1.4.
Stopping down to f/2.8 eliminates optical vignetting except for the extreme corners. Field images suggest that f/4 does nearly all the rest of the job.
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