Tamron 17-35 mm f/2.8-4 Di OSD
6. Distortion
More serious problems are experienced on full frame. At 17 mm you deal with a quite significant level of barrel deformations and our result amounted to −4.28%. In the middle of the focal range the distortion is negligible, getting to just +0.39%. At 35 mm it increases to +1.17% – hardly a bothersome level but certainly something easy to notice.
In this category the Tamron didn’t impress. For example the Tokina AT-X PRO FX SD 17–35 mm f/4 (IF) fared better on both ends of focal range.
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| Canon 50D, 17 mm | |||
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| Canon 50D, 26 mm | |||
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| Canon 50D, 35 mm | |||
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| Canon 5D III, 17 mm | |||
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| Canon 5D III, 26 mm | |||
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| Canon 5D III, 35 mm | |||
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