Tamron SP AF 10-24 mm f/3.5-4.5 Di II LD Aspherical (IF)
6. Distortion
Our tests show that ultra wide-angle variable focal length lenses never produce some especially large distortion. It’s easier to correct them with this aberration, as they usually have small zoom (the factor of 2x) and always operate on wide angles. Meanwhile, the distortion causes the most problems in lenses which have to work as wide angle and tele, which is the result of a large focal length factor.
Tamron 10-24 mm at the shortest focal length shows noticeable, but hardly onerous barrel distortion, whose level was measured to be -2.78%. For longer focal lengths the distortion is still barrel-like and amounts to-2.41% and -1.87% for the medium and the end of range respectively.
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These aren’t really stunning results. Both Sigma 10-20 mm and Canon 10-22 performed better here. The latter at its widest angle showed the barrel distortion of -2.4%, but for longer focal lengths this aberrations is practically equal to zero.
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