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Lens review

Samyang AF 14 mm f/2.8 EF

2 October 2018
Maciej Lata³³o

8. Vignetting

First let’s check how the Samyang AF 14 mm f/2.8 EF deals with vignetting on the smaller sensor of the Canon 50D – appropriate thumbnails you can find below.

Canon 50D, f/2.8 Canon 50D, f/4.0
Samyang AF 14 mm f/2.8 EF - Vignetting Samyang AF 14 mm f/2.8 EF - Vignetting


You get some chances to notice that aberration only at the maximum relative aperture where it reaches 27% (−0.92 EV). On stopping down the aperture to f/4.0 and f/5.6 its level drops to almost imperceptible values amounting to 12% (−0.38 EV) and 10% (−0.31 EV) respectively.

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Now let’s check how the situation changes after passing to full frame.

Canon 5D MkIII, f/2.8 Canon 5D MkIII, f/4.0
Samyang AF 14 mm f/2.8 EF - Vignetting Samyang AF 14 mm f/2.8 EF - Vignetting
Canon 5D MkIII, f/5.6 Canon 5D MkIII, f/8.0
Samyang AF 14 mm f/2.8 EF - Vignetting Samyang AF 14 mm f/2.8 EF - Vignetting


There are definitely more problems there. At the maximum relative aperture losses of light in the corners are significant, as much as 67% (−3.17 EV) and it is one of worst results in this class (only the Canon 2.8/14 II and the Irix 2.4/15 fared slightly weaker). By f/4.0 you can still observe a quite high level of that aberration, as the vignetting reaches 47% (−1.86 EV). You won’t have any problems with noticing the brightness loss also by f/5.6 and f/8.0 where it is, respectively, 33% (−1.16 EV) and 28% (−0.94). Even by f/11 you see slight vignetting, as it still reaches 25% (−0.83 EV) at that point.

Canon 5D MkIII, JPEG, f/2.8
Samyang AF 14 mm f/2.8 EF - Vignetting