Sigma A 20 mm f/1.4 DG HSM
6. Distortion
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.
Please Support UsIf you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio; only that way we will be able to continue providing you interesting content for free. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| Canon 50D, 20 mm | |||
 |
|||
| Canon 5D MkIII, 20 mm | |||
 |
|||
