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Vignetting for Zeiss Otus 28/1.4
Vignetting into the corners is a bit more than two stops at f/1.4, and two stops at frame edge. However, it is only about 5/4 stop at frame edge. Stopping down to f/2.8 reduces vignetting to less than a stop even in the extreme corners.
By f/4, frame illumination is almost uniform (on the order of 1/2 stop), with only a trace of darkening into the extreme corners; this is hardly noticeable even in uniform blue sky. This is about as low as one can expect in a 28mm lens.
Since sharpness is excellent even wide open, vignetting can be used as a sort of neutral density filter, for peripheral areas, e.g., bright white clouds or similar features places at edge or corner areas. Moreover, vignetting is a useful tool for visual emphasis (your author prefers significant wide-open vignetting for most shooting purposes).
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Diglloyd Guide to Zeiss offers comprehensive integrated coverage of Zeiss DSLR lenses for Canon and Nikon. Nearly a decade in the making, it covers everything you need to know for every lens in the ZF.2, ZE, Milvus and Otus lines. Guide to Mirrorless and Zeiss ZM rangefinder lenses in Guide to Leica.
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