LensTip.com

Lens review

Sigma 105 mm f/2.8 EX DG OS HSM Macro

20 September 2011
Arkadiusz Olech

8. Vignetting

One look at the thumbnails below, showing uniformly light planes, taken with the Canon 50D, and you know that on such a small sensor as the APS-C/DX there are no vignetting problems whatsoever.

Sigma 105 mm f/2.8 EX DG OS HSM Macro - Vignetting


Our measurements confirm it. At the maximum relative aperture the brightness loss in the frame corners amounts to 24% (-0.80 EV) which is not bothersome. On stopping down to f/4.0 we see this aberration disappear almost completely as the result is on the level of only 5% (-0.15 EV). The chart below shows the comparison between the Sigma and its rivals. It is clear the level of all three of them, presented in this category, is quite evened out.


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Sigma
105 OS
Nikkor
105 VR
Canon
100 IS
f/2.8
24%
25%
20%
f/4.0
5%
5%
5%


Let’s tackle the full frame performance now. One glance at thumbnails below and it becomes obvious the problems start getting more serious.

Sigma 105 mm f/2.8 EX DG OS HSM Macro - Vignetting


At the maximum relative aperture the vignetting reaches as high as 54% (-2.25 EV) and it is noticeably bigger than that of the Sigma’s immediate rivals. On stopping down to f/4.0 you see this aberration limited considerably but it remains visible and its level is 26% (-0.87 EV). Only by implementing f/5.6 you can make the problem disappear almost completely (7%).


Sigma
105 OS
Nikkor
105 VR
Canon
100 IS
f/2.8
54%
42%
43%
f/4.0
26%
26%
20%
f/5.6
7%
12%
8%


Sigma 105 mm f/2.8 EX DG OS HSM Macro - Vignetting