Sigma A 20 mm f/1.4 DG HSM review - Distortion

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Sigma A 20 mm f/1.4 DG HSM

3 November 2015

Arkadiusz Olech

6. Distortion

At the beginning of this chapter you should remind yourself the results of the Nikkor AF-S 20 mm f/1.8G ED in this category which really rose the standard pretty high. On the small APS-C/DX sensor it showed a slight barrel distortion of a value of −0.89% which, on full frame, reached a level of −1.53%.

The Sigma A 1.4/20 cannot boast of such a good result. It is true that on the smaller sensor it reaches just −0.66%, a level lower than the Nikkor, but it might have been caused by the differences in the size of the Nikon’S D7000 detector used in the test of the Nikkor and the detector of the Canon 50D, used in the case of the Sigma. When you try to take objective measurement on full frame the result of the Sigma is actually worse, amounting to −2.15%. The difference is perhaps not big but still the fact that the rival managed to perform a bit better is worth your notice.

As a kind of consolation you might add that, compared to the Sigma 20 mm f/1.8 EX DG Aspherical RF, there is noticeable improvement. The older Sigma had distortion of −2.2% already on the small APS-C/DX sensor. When compared to the older 1.8/20 or 2.8/20 constructions the progress is evident.

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