EXCERPT page containing first few paragraphs. 2021-12-02 17:44:50
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Vignetting (relative illuminance) is quite low, only one stop wide open.
Going to f/4 or f/5.6 improves vignetting to about 1/2 stop in the corners, there being little difference between f/4 and f/5.6 except in the extreme corners.
Thus, only unavoidable natural vignetting remains over most of the frame by f/4.
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
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