Sigma 12-24 mm f/4.5-5.6 II DG HSM
8. Vignetting
At the shortest focal length and the maximum relative aperture the vignetting reaches a high value of 41% (-1.54 EV). It decreases to 25% (-0.85) on stopping down the lens to f/5.6. By f/8.0 aperture the brightness loss in the corners of the frame amounts to 17% (-0.54 EV). Further stopping down doesn’t cause a measurable decrease of vignetting.
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In the case of 18 mm focal length and f/5.0 aperture the light fall-off in the frame corners is 37% (-1.34 EV).On slightly stopping down to f/5.6 we see this aberration decrease to 30% (-1.04 EV). By f/8.0 the vignetting reaches the value of 16% (-0.52 EV) and on stopping down to f/11 it decreases by the next 1%.
At the maximum focal length and the maximum relative aperture the vignetting gets to 31% (-1.06 EV). What’s interesting, by f/8.0 and f/11 it is within the margin of error the same, amounting to 15% (-0.47 EV).
This not exactly a great performance on the small detector but is just a prelude to what can be seen on full frame. The appropriate photos are shown below.
The combination of 12 mm focal length and f/4.5 aperture forces you to resign yourself to a really huge level of vignetting – 59% (-2.59 EV). Reducing the relative aperture helps but doesn’t make the problem disappear. By f/5.6 we still deal with the brightness loss amounting to 45% (-1.73 EV) in the corners and by f/8.0 it reaches 30% (-1.05 EV). Even applying the f/11 aperture doesn’t eliminate the problem completely because the vignetting is 25% (-0.85 EV) there so it still remains visible.
In the middle of the focal range the situation is a bit better. At the maximum relative aperture we got the vignetting as high as 52% (-2.10 EV) and by f/5.6 it amounted to 44% (-1.67 EV). Even by f/8.0 and f/11.0 it was still visible reaching 28% and 24% respectively.
At the maximum focal length the problems are the fewest but it doesn’t mean that they are negligible. In the case of f/5.6 aperture we must take into account the fact that the light fall-off might reach up to 45% (-1.72 EV). By f/8.0 that aberration decreases to the level of 25% (-0.84 EV). It is not much lower by f/11 and by f/16 where it is 21% (-0.68 EV).
As you can notice, the vignetting is a considerable problem in the case of the Sigma 12-24 II, no matter whether you work on a smaller or bigger sensor. It is bothersome throughout the whole focal range and for the major part of aperture range. You should remember though that with such angles of view a noticeable decrease of the vignetting level would have to entail a distinct increase of the lens’s dimensions.
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