Samyang 100 mm f/2.8 ED UMC MACRO review - Vignetting

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Samyang 100 mm f/2.8 ED UMC MACRO

22 August 2015

Arkadiusz Olech

8. Vignetting

First let’s check how the Samyang 2.8/100 Macro performs on the smaller sensor of the Canon 50D; the appropriate thumbnails are presented below.

Canon 50D, f/2.8	Canon 50D, f/4.0

Only by f/2.8 aperture you have slight chances of noticing the vignetting as that aberration amounts to 15% (−0.48 EV) there. When you stop down the aperture to f/4.0 the problem disappears completely with the light fall-off being just 4% (-0.12 EV).

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Now let’s see how the tested lens fares on full frame.

Canon 5D III, f/2.8	Canon 5D III, f/4.0

Canon 5D III, f/5.6	Canon 5D III, f/8.0

There are much more problems here. At the maximum relative aperture the brightness loss in the frame corners reaches a very high level of 49% (−1.95 EV). On stopping down the lens to f/4.0 you see that aberration decrease to a value of 24% (−0.80 EV), and by f/5.6 it goes down further to 14% (−0.45 EV). By f/8.0 all the problems disappear completely because the result amounts to just 9% (−0.27 EV).

In this category the Samyang couldn’t compete successfully with its direct rivals as well. The Tamron 2.8/90 VC, the Canon 2.8/100L and the Nikkor 2.8/105 VR had better results; only the Sigma 2.8/105 OS was weaker.