Samyang 50 mm f/1.4 AS UMC
8. Vignetting
At the maximum relative aperture its level is 23% (-0.77 EV) - a moderate value. The aberration becomes practically imperceptible by f/2.0 and f/2.8, reaching respectively 11% (−0.34 EV) and 6% (−0.19 EV).
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One glance at the thumbnails, presented below, and you know that more problems await you on full frame.
Working by f/1.4 you have to take into account the light loss of 49% (−1.94 EV) in the frame corners. After stopping down the lens to f/2.0 you are able to reduce that problem to 34% (-1.19 EV). The vignetting still remains noticeable by f/2.8, reaching 21% (-0.69 EV) and it becomes negligible only by g/4.0 and f/5.6 where it is respectively 11% (−0.33 EV) and 6% (−0.18 EV).
The results of the Samyang, when compared to those of its newest rivals, don’t look so bad. The tested lens remains slightly better than the Otus and a bit worse than the new Sigma A 1.4/50. The Nikkor 1.4/58G surpasses all of them as its vignetting level at the maximum relative aperture amounts to 39%.
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