Sigma A 14-24 mm f/2.8 DG HSM
8. Vignetting
| Canon 50D, 14 mm, f/2.8 | Canon 50D, 14 mm, f/4.0 |
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| Canon 50D, 19 mm, f/2.8 | Canon 50D, 19 mm, f/4.0 |
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| Canon 50D, 24 mm, f/2.8 | Canon 50D, 24 mm, f/4.0 |
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The short focal length is usually the biggest challenge at that point but it must be said the Sigma manages really fine. Slight light fall-off can be noticed only by f/2.8 where we measured its level as just 16% (−0.52 EV). The aberration disappears completely already by f/4.0, where we officially got 7% (−0.21 EV).
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In the middle of the focal range the situation is very similar indeed. By f/2.8 the vignetting amounts to 18% (−0.59 EV) and it decreases to just 6% (−0.17 EV) on stopping down the aperture to f/4.0.
At the maximum focal length and by the maximum relative aperture the brightness loss in the frame corners is 20% (−0.65 EV). Still already by f/4.0 the problem gets marginalized as the vignetting reaches just 6% (−0.18 EV).
Now let’s check the situation with the tested Sigma attached to the full frame Canon EOS 5D Mark III – appropriate thumbnails are shown below.
| Canon 5D III, 14 mm, f/2.8 | Canon 5D III, 14 mm, f/4.0 |
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| Canon 5D III, 19 mm, f/2.8 | Canon 5D III, 19 mm, f/4.0 |
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| Canon 5D III, 24 mm, f/2.8 | Canon 5D III, 24 mm, f/4.0 |
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At the very difficult combination of the 14 mm focal length and f/2.8 aperture the vignetting reaches a high value of 58% (−2.49 EV), a result noticeably worse than 46% shown by the Tamron 15–30 mm at 15 mm. Still you should remember that the Tamron offers you a slightly narrower angle of view so its task as a bit easier. By f/4.0 the vignetting decreases to a still significant value of 36% (−1.31 EV), and by f/5.6 it is already 32% (−1.11 EV). You can speak about a moderate level of that aberration only by f/8.0 and f/11, where we got the following results: 28% (−0.97 EV) and 23% (−0.78 EV). By f/16 the vignetting decreases even further to 17% (−0.55 EV).
A bit better situation can be seen in the middle of the focal range, where vignetting at the maximum relative aperture amounts to 42% (−1.55 EV) and then it decreases to 20% (−0.63 EV) on stopping down the aperture to f/4.0. By f/5.6 and f/8.0 the vignetting becomes practically imperceptible, reaching just 11% (−0.33 EV) and 10% (−0.31 EV) respectively.
Even better results you can observe at the maximum focal length. By f/2.8 the brightness loss in the frame corners amounts to 39% (−1.43 EV) and it decreases to 19% (−0.59 EV) on stopping down the aperture to f/4.0. By f/5.6 the vignetting stops being bothersome at all because it reaches just 9% (−0.27 EV).
| Canon 5D Mk III, 14 mm, f/2.8 |
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| Canon 5D Mk III, 19 mm, f/2.8 |
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| Canon 5D Mk III, 24 mm, f/2.8 |
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