Samyang XP 14 mm f/2.4
8. Vignetting
| Nikon D7000, f/2.4 | Nikon D7000, f/2.8 |
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For such a wide angle of view (after all even on the DX sensor of the Nikon you deal with a field of 90.7 degrees) the results are very good. At the maximum relative aperture the brightness loss in the frame corners reaches 20% (−0.64 EV). On stopping down the lens to f/2.8 that aberration decreases to 12% (−0.36 EV). By f/4.0 all problems disappear practically completely, officially being 8% (−0.24 EV).
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Now let’s check the situation on much more demanding full frame – thumbnails from the Nikon D3x are presented below.
| Nikon D3x, f/2.4 | Nikon D3x, f/2.8 |
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| Nikon D3x, f/4.0 | Nikon D3x, f/5.6 |
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According to expectations the results are higher. By f/2.4 the light falloff in the frame corners amounts to 47% (−1.84 EV); it is a significant value but still it compares favourably with the performance of the rivals. The Irix 2.4/15 fared dismally in this category, showing 72% of vignetting. The Canon 2.8/14 II was not much better, with 65% of brightness loss. In the case of the slower Samyang 2.8/14 the vignetting was 55% so worse than that of the new lens as well.
On stopping down the aperture to f/2.8 the aberration decreases to 36% (−1.30 EV), and after employing the f/4.0 relative aperture it becomes moderate, amounting to 27% (−0.91 EV). By f/5.6 and by f/8.0 we got respectively: 23% (−0.75 EV) and 19% (−0.62 EV). Further stopping down didn’t have any measurable effect on vignetting.
| Nikon D3x, JPEG, f/2.4 |
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