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Lens review

Sigma C 16 mm f/1.4 DC DN

22 January 2018
Maciej Latałło

5. Chromatic and spherical aberration

Chromatic aberration

Unfortunately the Sigma cannot be praised for the correction of longitudinal chromatic aberration. Its level was clearly visible even after stopping down the aperture to f/2.0, no matter what camera you attached the tested lens to.

Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration

Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration


The situation with the lateral variety of that aberration was better – a graph below presents the results correlative with the detector used and the aperture value.

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Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration


Most of values range from 0.05-0.07% so they are low. It means that lateral chromatic aberration shouldn’t be bothersome in real life photos.

Olympus E-M5 II, RAW, f/2.8 Sony A7R II, RAW, f/2.8
Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration


Spherical aberration

Not entirely corrected spherical aberration might be the cause of less-than-impressive Sigma performance by f/1.4. We saw a slight “focus shift” effect while testing the lens on both bodies; also circles of light, shown below, produced in front of and behind the focus, are a classic example of that aberration. The circles before the focus are soft on edges and those after the focus feature a lighter rim. It is not a very distinct effect (its level is a bit higher with the lens attached to the Olympus and a bit lower when the lens cooperates with the Sony) but you can hardly call this degree of spherical aberration correction good.

Olympus E-M5 II, f/1.4, in front of Olympus E-M5 II, f/1.4, behind
Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration

Sony A7R II, f/1.4, in front of Sony A7R II, f/1.4, behind
Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration Sigma C 16 mm f/1.4 DC DN - Chromatic and spherical aberration