Tokina AT-X PRO DX 11-20 mm f/2.8
6. Distortion
Most of ultra wide angle lenses tested on small sensors have barrel distortion of around −2% at the widest angle and then it usually decreases below −1% at the longer end of the focal range. The Tokina 11-16 mm II didn’t impress us in this category because at 11 mm it had a noticeable level of barrel distortion amounting to −2.95%. We were very curious how the 11-20 mm model would fare here; it is known that the increase of the focal range makes it more difficult to correct distortion.
The result at the widest angle worsened a bit and it amounts to −3.15% now. Still it is a small and completely acceptable price to pay for the increase of the focal length. The rivals, though, are better in this category.
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The problems disappear when you pass to the higher focal lengths. At 16 mm you get a distortion level of −0.73%, and at 20 mm that of −0.21%. Those values shouldn’t bother you at all.
Canon 50D, 11 mm | |||
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Canon 50D, 16 mm | |||
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Canon 50D, 20 mm | |||
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