Pentax smc DA 50 mm f/1.8
6. Distortion
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All 1.8/50 class lenses, tested on APS-C/DX sensors, show slight barrel distortion which value doesn’t exceed -1%. The Pentax is not an exception to that rule – in its case the distortion level amounts to -0.39%. It compares very favourably with its rivals as you can notice glancing at a chart below. The comparison with the Sony is the most objective one because that lens was also designed for a smaller sensor and here the Pentax is noticeably better.
| |
Nikkor AF-S 1.8/50G |
Nikkor AF 1.8/50D |
Pentax 1.8/50 |
Sony 1.8/50 |
Canon 1.8/50 |
| APS-C/DX |
−0.49% |
−0.20% |
−0.39% |
−0.91% |
−0.42% |
 |
