Samyang AF 14 mm f/2.8 EF
8. Vignetting
Canon 50D, f/2.8 | Canon 50D, f/4.0 |
![]() |
![]() |
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.
Please Support UsThe coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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 |
![]() |
![]() |
Canon 5D MkIII, f/5.6 | Canon 5D MkIII, f/8.0 |
![]() |
![]() |
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 |
![]() |