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Vignetting for Zeiss Otus 100mm f/1.4 APO-Sonnar
Vignetting at f/1.4 is more than two stops in the corners, that is, the corners are more like T/3.2. See What are F-stop and T-stop?.
Stopping down to f/2.8 eliminates nearly all vignetting except for the corners, with f/4 brightening the corners just a bit more, and leaving only natural vignetting of about 1/4 stop.
See the two examples.
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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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