Sigma 85 mm f/1.4 EX DG HSM
8. 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.
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.
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