Nikon Nikkor AF-S Micro 60 mm f/2.8G ED
8. Vignetting
By f/2.8 you can notice some brightness loss in the frame corners as it reaches the visible level of 36% (−1.30 EV) there. Only on stopping down to f/4.0 we can make the problem disappear because then the vignetting decreases to 12% (-0.39 EV) and becomes imperceptible by f/5.6, where it is just 7%.
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The real difficulties we encounter on full frame. The thumbnails below show it perfectly well.
At the maximum relative aperture, in the frame corners, the light fall-off gets to 55% (-2.32 EV). The vignetting is still easily perceptible by f/4.0, where it amounts to 36% (-1.29 EV). Only by f/5.6 and f/8.0 we can speak about a moderate and low level of this aberration as the brightness loss measured for the frame corners, is 22% and 11% respectively.