Pentax smc FA 31 mm f/1.8 AL
8. Vignetting
The chart below shows that the Pentax fully uses its advantage, stemming from the fact that its image circle is adapted to full frame. The vignetting at every aperture value is lower than that of its competitors. The tested lens wins even with the faster Sigma.
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|
|
Pentax 1.8/31 |
Sony DT 1.8/35 |
Nikkor 1.8/35 |
Sigma 1.4/30 |
Pentax 2.4/35 |
| f/1.8 |
27% |
44% |
37% |
31% |
− |
| f/2.0 |
24% |
39% |
31% |
28% |
− |
| f/2.8 |
10% |
14% |
22% |
22% |
25% |
 |
