Irix 15 mm f/2.4 Blackstone
6. Distortion
The test of the Canon EF 14 mm f/2.8 USM II proved that even with such parameters you can correct distortion sensibly well without introducing moustache deformations. On the smaller APS-C sensor its result was −1.23%, and it increased to −3.18% on full frame.
The Irix compares to the Canon favourably and when you stack it up against the Samyang, its performance seems pretty brilliant. It is clear the constructors cared about good distortion correction and they did a splendid job. On the smaller APS-C/DX sensor we got small barrel variety, amounting to −0.50%. On full frame that value increased to −2.68% but still it is better than the distortion of noticeably more expensive Canon.
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| Canon 50D, 15 mm | |||
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| Canon 5D Mk III, 15 mm | |||
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