Samyang 14 mm f/2.8 ED AS IF UMC
8. Vignetting
More problems occurred on full frame where the vignetting reached 59% by f/2.8. We expected some improvement here and we noticed it. The redesigned lens at maximum aperture has the light fall-off amounting to 55% (-2.31 EV). Such a result is perhaps not significantly better but still.
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On stopping down to f/4.0 the vignetting decreases to 39% and by f/5.6 it reaches 29%. On further stopping down we can see very slight improvement. By f/8.0 the vignetting is 24% and by f/11 – just 2% less. By f/16 we must still take into account the light fall-off reaching 20% in the corners. After all, such is the usual performance of a wide angle device on full frame…
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