Sigma A 24-35 mm f/2.0 DG HSM
5. Chromatic and spherical aberration
Chromatic aberration
The longitudinal chromatic aberration is corrected well. Its influence seems to be noticeable near the maximum relative aperture but it is not huge and it disappears almost completely on stopping down the aperture to f/2.8.
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Two graphs below present the lateral chromatic aberration performance of the lens; the first one concerns the edge of the APS-C/DX sensor and the second one – the edge of full frame.
As you can notice the lateral chromatic aberration is not a problem either. Its highest level can be seen at the shortest focal length where it reaches 0.08-0.9%. Such values remain still on a borderline between low and medium levels. For a change at 35 mm the aberration is low everywhere and very difficult to spot in real life photos.
| Canon 5D III, 24 mm, f/2.0 | Canon 5D III, 35 mm, f/2.0 |
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Spherical aberration
The Sigma 24–35 mm doesn’t show any problems related to spherical aberration and both the first photo of this chapter (lack of „focus shift” effect) and the images of circles of light we got in front of and behind the focus, which are pretty similar, prove that much.
| Canon 5D MkIII, 35 mm, f/2.0, in front of | Canon 5D MkIII, 35 mm, f/2.0, behind |
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