Zoom lenses with high zoom multiple and the angle of view reaching over 70 degrees at the wide end often show the distortion level ranging from – 4 to – 5 %. For instance the Nikkor 18-70 mm had the result at the level of – 4.5% , the Zeiss 16-80 mm reached almost – 4%, and the Canon 17-85 mm, the most notorious in this category, noticed the value of almost – 6%. The results of the Sigma 17-70 mm OS HSM compare very favourably with those of its competitors. At 17 mm we have −3.28% barrel distortion. On increasing the focal length the geometric deformations decrease steeply and change the sign. At 28 mm the distortion becomes already pincushion and its value amounts to just 0.44%. Then that aberration starts to increase slowly – at 50 mm it is 1.11% and at 70 mm 1.07%. Such values are not bothersome – you are able to notice them only in specific conditions. The performance of the tested lens in this category can be deemed satisfactory then.
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