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Lens review

Sigma 85 mm f/1.4 EX DG HSM

20 December 2010
Arkadiusz Olech

8. Vignetting

First, let’s check how the brightness loss in the frame corners presents itself on a small sensor of the DX format. The thumbnails, shown below, will help us to do so.

Sigma 85 mm f/1.4 EX DG HSM - Vignetting


As you can notice the vignetting is practically nonexistent here. Even at the maximum relative aperture the light fall-off in the frame corners amounts to just 15% (-0.48 EV) and it decreases to a totally negligible value of 6% by f/2.0.

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The chart below compares the Sigma with its competitors and you can see the tested lens wins hands down here!


Sigma
1.4/85
Nikkor
AF-S 1.4/85
Canon
85 mm f/1.2L
Samyang
1.4/85
Zeiss
1.4/85
f/1.4
15%
25%
23%
25%
21%
f/2.0
6%
10%
9%
9%
8%
f/2.8
2%
2%
2%
2%
2%


Let’s pass to the description of full frame results. The appropriate thumbnails can be seen below.

Sigma 85 mm f/1.4 EX DG HSM - Vignetting


At the maximum relative aperture the vignetting is visible as it reaches the value of 37% (-1.33 EV) On stopping down the aperture to f/2.0 this aberration decreases to the level of 21% (-0.66 EV) and it becomes not bothersome by f/2.8 where it gets to 16%. The problems with vignetting are over by f/4.0 and f/5.6 where the results we obtained amounted to respectively 12% and 9%.

How does the lens compare with its rivals? The chart below will allow us to assess it.


Sigma
1.4/85
Nikkor
AF-S 1.4/85
Canon
85 mm f/1.2L
Samyang
1.4/85
Zeiss
1.4/85
f/1.4
37%
48%
43%
38%
41%
f/2.0
21%
35%
22%
22%
22%
f/2.8
16%
16%
5%
13%
7%
f/4.0
12%
5%
4%
8%
5%


The advantage of the Sigma is clearly noticeable by f/1.4 and by f/2.0 where the tested lens gets better results than its competitors. In its case, though, we also observe the slowest decrease of vignetting on stopping down so by f/2.8 and f/4.0 the rivals prevail. Fortunately for the Sigma its defeat is still situated on a level which is not obtrusive so its defeat won’t hurt us much.


Sigma 85 mm f/1.4 EX DG HSM - Vignetting