Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX review - Distortion

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Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX

30 March 2016

Arkadiusz Olech

6. Distortion

With the parameters offered by the Tokina, tested here, the distortion correction is not an easy task. Still it seems the producer managed it pretty well. At 14 mm focal length that aberration level is the highest and you have to take into account barrel distortion of −2.55%. It drops to −1.35% at 17 mm, and by 20 mm it decreases further to an imperceptible level of −0.71%.

Because of an atypical focal range of the tested Tokina it would be difficult to compare it to any rival. Still you can remind here the results of other fast zoom designed for smaller sensors so the Sigma A 18–35 mm f/1.8 DC HSM. In its case the highest distortion level you observed at 18 mm and it amounted to −2.46%. It is a result within the margin of error the same as that reached by the Tokina; mind you the tested lens got it at 14 mm so for a much wider angle.

Canon 50D, 14 mm

Canon 50D, 17 mm

Canon 50D, 20 mm

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