Carl Zeiss Distagon T* 25 mm f/2.0 ZE/ZF.2
8. Vignetting
It can be seen at the maximum relative aperture where it amounts to 28% (-0.96%) but already by f/2.8 it is slight, reaching just 13% (-0.39 EV) and by f/4.0 it disappears completely (9%). Comparing these results to those of competitors you can assume there will be problems on full frame - you should notice that the vignetting level of the Zeiss by f/2.0 is very similar to the vignetting level of the Nikkor by f/1.4.
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| |
Zeiss 2.0/25 |
Nikkor 1.4/24G |
Canon 1.4/24L II |
Samyang 1.4/24 |
| f/1.4 |
– |
29% |
34% |
32% |
| f/2.0 |
28% |
12% |
17% |
27% |
| f/2.8 |
13% |
7% |
9% |
15% |
The problems on full frame are undoubtedly more serious – one look at the thumbnails is enough to see it rather clearly.
At the maximum relative aperture the vignetting gets to a huge level of 67% (-3.19 EV). On stopping down the aperture to f/2.8 the brightness loss in the frame corners remains pronounced, reaching 46% (-1.78 EV). The performance by f/4.0 and f/5.6 is far from perfect as well, being respectively 34% (-1.20 EV) and 29% (-0.99 EV) On further stopping down you don’t see the level of this aberration decrease – it doesn’t want to drop lower than 25%.
The comparison with its competitors, shown below, proves that the Zeiss is much worse than the faster Nikkor. In the case of a duel between the Canon and the Zeiss we must admit the tested lens, despite being slower, fights as equal.
| |
Zeiss 2.0/25 |
Nikkor 1.4/24G |
Canon 1.4/24L II |
Samyang 1.4/24 |
| f/1.4 |
- |
54% |
78% |
65% |
| f/2.0 |
67% |
38% |
62% |
63% |
| f/2.8 |
46% |
25% |
43% |
46% |
| f/4.0 |
34% |
19% |
37% |
31% |
 |
