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Lens review

Sigma C 16 mm f/1.4 DC DN

22 January 2018
Maciej Latałło

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

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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