Carl Zeiss Otus 85 mm f/1.4
8. Vignetting
There are chances to notice the vignetting only at the maximum relative aperture and even there its level remains moderate, amounting to 24% (-0.79 EV). The problem disappears almost completely by f/2.0, where that aberration reaches just 10% (-0.31 EV).
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The appearance of defocused light points the frame corners suggested a lot of vignetting-related problems on full frame. The thumbnails below prove that indeed, these problems can make themselves felt.
At the maximum relative aperture the brightness loss is really noticeable, being 56% (-2.41 EV). Such a result is simply weak, taking into account the dimensions of the lens and the fact that other, much smaller 1.4/85 instruments when wide open had the vignetting on a level closer to 40%, not over 50%.
Fortunately the situation improves swiftly on stopping down the lens. By f/2.0 the light fall-off in the frame corners gets to 35% (-1.27 EV) and by f/2.8 it reaches 15% (-0.48 EV). The vignetting practically disappears by f/4.0 where it is just 6% (-0.19 EV).
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