Sony DT 35 mm f/1.8 SAM
8. Vignetting
By f/1.8 the brightness loss in the frame corners reaches a very distinct level of 44% (-1.65 EV). On slight stopping down to f/2.0 you see the vignetting decrease to the value of 39% (-1.44 EV). The problem stops being a nuisance near f/2.8 where the vignetting drops to 14% (-0.42 EV) and it becomes completely imperceptible (4%) by f/4.0.
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The chart below shows a comparison between the Sony and its direct rivals, quite unflattering for the tested lens we must add.
|
|
Sony DT 1.8/35 |
Nikkor 1.8/35 |
Sigma 1.4/30 |
Pentax 2.4/35 |
| f/1.8 |
44% |
37% |
31% |
− |
| f/2.0 |
39% |
31% |
28% |
− |
| f/2.8 |
14% |
22% |
22% |
25% |
 |
