LensTip.com

Lens review

Sigma C 24 mm f/2 DG DN

7 December 2021
Maciej Latałło

5. Chromatic and spherical aberration

Chromatic aberration

It seems using as many as three low dispersion glass elements in the construction of the lens paid off. The Sigma doesn't have almost any problems with longitudinal chromatic aberration, it's enough to glance at photos, shown below, that we took by f/2.0 and f/2.8 to see that very clearly.

Sigma C 24 mm f/2 DG DN - Chromatic and spherical aberration


What about the correction of lateral chromatic aberration? A respective graph you can find below.

Sigma C 24 mm f/2 DG DN - Chromatic and spherical aberration


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

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


The differences between both types of detectors are negligible and in both cases the aberration level is practically zero. It means it won't be bothersome in real life photos and you can only admire such an exemplary performance – a round of applause!

A7R III, RAW, FF, f/2.0 A7R III, RAW, FF, f/8.0
Sigma C 24 mm f/2 DG DN - Chromatic and spherical aberration Sigma C 24 mm f/2 DG DN - Chromatic and spherical aberration

Spherical aberration

First photos of this chapter show that after stopping down the aperture by 1 EV there is a slight shift of depth of field toward greater distances. It means spherical aberration is not corrected in a perfect way. Also the appearance of out-of-focus circles of light, reached before and behind the focus, confirms that conjecture – the difference between them is noticeable as the circle reached behind the focus features a brighter rim.

A7R III, f/2.0, before A7R III, f/2.0, after
Sigma C 24 mm f/2 DG DN - Chromatic and spherical aberration Sigma C 24 mm f/2 DG DN - Chromatic and spherical aberration