LensTip.com

Lens review

Sigma A 12-24 mm f/4 DG HSM

23 October 2016
Arkadiusz Olech

6. Distortion

A 12-24 mm lens, even cooperating with the smaller APS-C/DX sensor, provides angles of view reaching almost 100 degrees; as you can imagine for such an instrument distortion correction is not an easy task. Still the Sigma performs admirably here. While attached to the Canon 50D at 12, 18 and 24 mm we got the following results: −0.82%, +0.27% and +0.24%. They mean that in photos provided by the smaller sensor you won’t experience any distortion-related problems, no matter what focal length you employ.

Still we were very curious about the full frame performance of the lens. Its predecessor fared quite well, showing barrel distortion of −2.67% at the widest angle but the Canon 11-24 mm didn’t exactly distinguish itself in this category; still you have to remember it faced a more difficult task as its angle of view was wider.

At 12 mm the barrel distortion level of the Sigma A 12–24 mm f/4.0 is noticeable but moderate, amounting to −2.54%. Already at 14 mm it decreases to −0.50% so becomes practically imperceptible. With the increase of the focal length the distortion changes sign and at 16 mm you deal with its pincushion variety amounting to +0.75%. At 18 mm it increases to +1.25%, and at 24 mm it reaches +1.66%.


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

To sum up the Sigma fares better in this category than its predecessor and the rival Canon, taking proper care of distortion correction. With such wide angles of view such a performance should only be praised.

Canon 50D, 12 mm
Sigma A 12-24 mm f/4 DG HSM - Distortion
Canon 50D, 18 mm
Sigma A 12-24 mm f/4 DG HSM - Distortion
Canon 50D, 24 mm
Sigma A 12-24 mm f/4 DG HSM - Distortion

Canon 5D MkIII, 12 mm
Sigma A 12-24 mm f/4 DG HSM - Distortion
Canon 5D MkIII, 18 mm
Sigma A 12-24 mm f/4 DG HSM - Distortion
Canon 5D MkIII, 24 mm
Sigma A 12-24 mm f/4 DG HSM - Distortion