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Lens review

Irix 15 mm f/2.4 Blackstone

27 September 2016
Szymon Starczewski

6. Distortion

Let’s start with checking how the direct rivals performed in this category. The performance of the Samyang 14 mm f/2.8 ED AS IF UMC could be described only as a huge catastrophe. Already on the smaller APS-C/DX sensor the level of distortion got to a very high value of −5.44%. On full frame the result amounted to −7.21% but if not for distinct moustache distortion it would be definitely closer to −10%.

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
Irix 15 mm f/2.4 Blackstone - Distortion
Canon 5D Mk III, 15 mm
Irix 15 mm f/2.4 Blackstone - Distortion