Sigma 18-125 mm f/3.8-5.6 DC OS HSM
6. Distortion
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As far as distortion is concerned, it’s hard not to expect it in a lens of these parameters, dimensions and price. It’s worth to emphasize that here Sigma performs much better than the competitors. Nikkors were weak in this category, showing a “barrel” at 18 mm of values from -4.6% to -5.0%, and at longer focal lengths a “pincushion” of a visible level of 2%. Sony 16-105 mm performed better, showing distortion of -4.67% at the wide angle, but at longer focal lengths didn’t cause any troubles recording results from 1.0% to 1.4%.
As we already mentioned, Sigma 18-125 mm OS comes out the best here. At the shortest focal length we can see a distinct barrel distortion, whose level was measured to be -4.25%. Together with increasing the focal length the aberration decreases very fast, changes sign and at 35 mm is pincushion with little troublesome value of 0.78%. Then the distortion is bigger, but still at an acceptable level of 1.37% at 70 mm and 1.19% at 125 mm.
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