Nikon Nikkor AF-S 24 mm f/1.4G ED
8. Vignetting
The result is a bit better than that of the Canon because at the maximum relative aperture the brightness loss in the frame corners amounted to 29% (-0.98% EV). The problem disappears completely on further stopping down because by f/2.0 and f/2.8 the vignetting is 12% and 7% respectively.
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The performance on full frame is of course the most serious test. Below you can see the result presented in form of test photos.
Although the vignetting is high the Nikkor fares much better than the Canon. At the maximum relative aperture the light fall-off in the frame corners is 54% (-2.25 EV). On stopping down to f/2.0 there is a significant improvement but still the vignetting remains on a huge level of 38% (-1.37 EV). The aberration remains visible by f/2.8 and f/4.0 as well, amounting to 25% and 19% respectively. Only by implementing f/5.6 we can make the problem insignificant (13%).