LensTip.com

Lens review

Sigma C 16 mm f/1.4 DC DN

22 January 2018
Arkadiusz Olech

6. Distortion

Micro 4/3 bodies often correct distortion on JPEG files on their own so we weren’t especially surprised by a very low result, just −0.25%, which we got for that format with the help of the Olympus E-M5 II. The RAW file format showed the real value of that aberration which amounted to −2.39%.

The APS-C sensor is even a greater challenge for such an optical construction. As the Sony A7R II doesn’t correct distortion automatically, the results for JPEG and RAW formats are identical, amounting to −3.55%. It is a significant value and it might be considered even a bigger flaw because it is reached after introducing slight moustache distortion. If you limit the area of our measurements to 1:1 markers, the level of barrel distortion, without any traces of bends connected to the moustache nature of that aberration, will increase to −3.92%.

Olympus E-M5 II, JPEG
Sigma C 16 mm f/1.4 DC DN - Distortion
Olympus E-M5 II, RAW
Sigma C 16 mm f/1.4 DC DN - Distortion


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

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

Sony A7R II, JPEG
Sigma C 16 mm f/1.4 DC DN - Distortion
Sony A7R II, RAW
Sigma C 16 mm f/1.4 DC DN - Distortion