The Sigma 17-35 and the Canon 17-40 mm accustomed us to the lack of problems with deformation on APS-C/DX sensors. Let’s remind here that at the widest angle the Sigma had a quite low barrel distortion of –1.7% and the Canon reached the value of –2.7%, a bit higher but still acceptable. Unfortunately the Tamron 17-35 mm didn’t repeat those results and fared in this category the worst, although still better than typical zoom lenses, designed to work on small sensors. At 17 mm the level of barrel distortion, measured by us, amounted to –3.1%. At 24 mm the distortion decreased to the level of –1.1% and only at 35 mm it became almost zero (-0.03%)
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