Sigma C 18-300 mm f/3.5-6.3 DC MACRO OS HSM
8. Vignetting
| 18 mm, f/3.5 | 18 mm, f/5.6 |
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| 50 mm, f/4.8 | 50 mm, f/5.6 |
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| 100 mm, f/5.6 | 100 mm, f/8.0 |
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| 200 mm, f/6.3 | 200 mm, f/8.0 |
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| 300 mm, f/6.3 | 300 mm, f/8.0 |
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At a difficult combination of the maximum relative aperture and wide angle the Sigma had vignetting amounting to 33% (-1.16 EV). It is the best result in the whole group of megazooms compared in this test. The older Nikkor’s result was 41% and the newer one’s amounted to 35%. Also the Tamron got 35% although, in its case, the standards were definitely raised higher because that result concerned the 16 mm focal length. Anyway the Sigma has here a small advantage over its rivals. When you stop down the aperture to f/4.0 the vignetting decreases to 30% (−1.04 EV), and by f/5.6 it is 18% (−0.57 EV). By f/8.0 and f/11.0 that aberration reaches respectively 12% (−0.38 EV) and 10% (−0.32 EV).
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When you employ the 50 mm focal length and f/4.8 aperture you must take into account the loss of light of 28% (−0.94 EV) in the frame corners. The rivals actually fared better here; for example the older Nikkor’s vignetting was just 9% and that of the Tamron amounted to 12%. What’s interesting, in the case of the Sigma the vignetting level didn’t drop on stopping down, at least not as fast as we would like it to do. By f/5.6 it got to 22% (−0.73 EV), and by f/8.0 to 14% (−0.43 EV). Only by f/11.0 that aberration became imperceptible and decreases to 9% (−0.27 EV).
At 100 mm focal length the results are pretty similar. In the case of the maximum relative aperture the vignetting reaches 26% (−0.89 EV); then it decreases to 15% (−0.47 EV) on stopping down to f/8.0. By f/11.0 that aberration becomes imperceptible because it drops further to 10% (−0.31 EV).
Not much changes when you pass to 200 mm focal length. By f/6.3 the vignetting is 27% (−0.91 EV), by f/8.0 it decreases to 20% (−0.63 EV). By f/11.0 and f/16.0 that aberration’s level gets to, respectively, 11% (−0.35 EV) and 6% (−0.17 EV).
Another slight increase you can notice at the maximum focal length. The f/6.3 aperture means you have to get used to the loss of light of 29% (-1.01 EV) and by f/8.0 the vignetting is still 19% (−0.62 EV). Only after stopping down to f/11.0 and f/16.0 the vignetting is being reduced to an imperceptible levels of, respectively, 11% (−0.35 EV) and 4% (−0.13 EV).
The chart below sums up the properties of lenses belonging to this class of equipment in the vignetting category. The results concern maximum relative apertures at every focal length detailed. When you follow this comparison please keep in mind that the Tamron was tested on a slightly smaller sensor of the Canon 50D (1.6x multiplier).
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| Sigma 18–300 f/3.5–6.3 OS |
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| Nikkor 18–300 f/3.5–6.3 VR |
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| Nikkor 18–300 f/3.5–5.6 VR |
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| Tamron 16–300 f/3.5–6.3 VC |
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