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Lens review

Sigma C 45 mm f/2.8 DG DN

28 February 2020
Maciej Latao

5. Chromatic and spherical aberration

Chromatic aberration

The Sigma C 45mm f/2.8 DGDN doesn't have any problems with correction of longitudinal chromatic aberration. Colouring of out-of-focus images is really very slight so it shouldn't bother you in real life photographs.

Sigma C 45 mm f/2.8 DG DN - Chromatic and spherical aberration


Now let's check the correction of lateral chromatic aberration – the graph below presents its performance depending on aperture values for both types of detectors.

Sigma C 45 mm f/2.8 DG DN - Chromatic and spherical aberration


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The performance, once again, should be called excellent. The results are within a very low level, ranging from 0.01 to 0.04%. In practice it means that aberration won't be felt at all.

A7RII, RAW, f/2.8 A7RII, RAW, f/11.0
Sigma C 45 mm f/2.8 DG DN - Chromatic and spherical aberration Sigma C 45 mm f/2.8 DG DN - Chromatic and spherical aberration


Spherical aberration

In first photos of this chapter it would be difficult to notice any traces of 'focus shift' but when you look at defocused circles of light you'll find that spherical aberration remains present. The circle before the focus shows a quite even light spread but the one we got after the focus is characterized by a light rim.

A7RII, f/2.8, before A7RII, f/2.8, after
Sigma C 45 mm f/2.8 DG DN - Chromatic and spherical aberration Sigma C 45 mm f/2.8 DG DN - Chromatic and spherical aberration