Samyang AF 14 mm f/2.8 EF
8. Vignetting
| Canon 50D, f/2.8 | Canon 50D, f/4.0 |
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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 |
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| Canon 5D MkIII, f/5.6 | Canon 5D MkIII, f/8.0 |
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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 |
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