LensTip.com

Lens review

Samyang 50 mm f/1.4 AS UMC

3 December 2014
Arkadiusz Olech

8. Vignetting

On the smaller sensor of the Canon 50D the vignetting shouldn’t cause any serious problems and the thumbnails, shown below, are the proof.

Samyang 50 mm f/1.4 AS UMC - 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.

Samyang 50 mm f/1.4 AS UMC - Vignetting


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%.

Samyang 50 mm f/1.4 AS UMC - Vignetting