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Lens review

Samyang 135 mm f/2.0 ED UMC

5 July 2015
Szymon Starczewski

8. Vignetting

First let’s check how the Samyang 2/135 fares in this category when tested on a small sensor of the Canon 50D – the appropriate thumbnails are presented below.

Canon 50D, f/2.0 Canon 50D, f/2.8
Samyang 135 mm f/2.0 ED UMC - Vignetting Samyang 135 mm f/2.0 ED UMC - Vignetting


In this case the vignetting is not bothersome. At the maximum relative aperture it amounts to 24% (−0.78 EV) and could be considered moderate. The problem disappears completely by f/2.8 where the vignetting decreases to 8% (−0.26 EV).

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Now let’s see how the situation changes of full frame.

Canon 5D III, f/2.0 Canon 5D III, f/2.8
Samyang 135 mm f/2.0 ED UMC - Vignetting Samyang 135 mm f/2.0 ED UMC - Vignetting
Canon 5D III, f/4.0 Canon 5D III, f/5.6
Samyang 135 mm f/2.0 ED UMC - Vignetting Samyang 135 mm f/2.0 ED UMC - Vignetting


Here the problems are much more serious. At the maximum aperture you have to take into account the loss of 57% (−2.44 EV) of light in the frame corners. It is really a lot. In the case of the Zeiss Apo Sonnar 2/135 it was 38% and the brightness loss of the Canon amounted to 49%. Vignetting seems to be the first category where the Samyang is defeated by its rivals.

The vignetting can be also noticed without any problems by f/2.8 where we got a result of 32% (−1.13 EV). A low level of that aberration you see by f/4.0 where it reaches 19% (−0.60 EV) and by f/5.6 the problem disappears almost completely (10%).

Samyang 135 mm f/2.0 ED UMC - Vignetting