Pentax smc FA 31 mm f/1.8 AL
6. Distortion
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As you can notice consulting the chart below, in the category of distortion the Pentax uses its advantage of a device designed for full frame. Barrel distortion, shown by the tested lens, is slight and noticeably lower than that of such rivals as the Sony, the Sigma or the Nikkor. What’s interesting, the cheap Pentax 2.4/35 fares a tad better than the tested lens. You should remember, though, that in its case we also deal with a full frame construction based on a slightly modified 2/35 model. There is also a difference in focal lengths - it is easier to correct distortion at 35 mm than at 31 mm.
|
|
Pentax 1.8/31 |
Sony DT 1.8/35 |
Nikkor 1.8/35 |
Sigma 1.4/30 |
Pentax 2.4/35 |
| 30–35 mm |
−0.88% |
−1.38% |
−1.94% |
−2.10% |
−0.75% |
 |
