Voigtlander Nokton 17.5 mm f/0.95 Aspherical
8. Vignetting
At the maximum relative aperture the brightness loss in the frame corners goes to an exceptionally high value of 68% (-3.28 EV). After using f/1.4 the vignetting is still huge, reaching 48% (-1.88 EV). That aberration becomes moderate on stopping down the lens to f/2.0, where it is 25% (-0.82 EV). You can speak about low or negligible level from f/2.8 aperture because the vignetting reaches just 11% (-0.33 EV) there.
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Are these results really as weak as it seems at first glance? Let’s ponder over that question for a while. The Nokton 0.95/17.5 is a very good equivalent of 1.4/35 models for full frame. It provides the same angle of view and not much worse depth of field; it also allows us to improve the shutter speed (or use lower ISO). How fare 1.4/35 class lenses when it comes to vignetting on full frame? Their performance is very similar. A reputable L-series Canon lens has as much as 70% of light fall-off and the Nikkor 1.4/35G - 60%. The Samyang fared the best in this group, losing about 48% of its brightness.
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