Sigma S 200 mm f/2 DG OS
5. Chromatic and spherical aberration
Chromatic aberration
The inner optical construction of the Sigma S 200 mm f/2 DG OS features as many as four low dispersion glass elements; small wonder we didn't expect any significant problems connected to the correction of longitudinal chromatic aberration. Photos below prove that we were right. In fact only at the maximum relative aperture in out-of-focus areas positioned further away in the frame, we are able to notice slight colouring. Still, such an effect is not significant and it disappears practically completely on stopping down the aperture. |
When it comes to lateral chromatic aberration you can describe it in similar terms as the longitudinal variant.
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The results stay near 0.04-0.05% so are on the borderline between low and very low levels. If you remind yourself the results of different reflex camera models you might notice that the Canon fared here a tad better and the Nikkor a tad weaker. Overall we think the Sigma fits well the high level presented by this class of lenses in this category.
| A7R IIIa, RAW, f/2.0 | A7R IIIa, RAW, f/16.0 |
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Spherical aberration
In first photos of this chapter it would be difficult to notice any focus shift effect. When it comes to the appearance of out-of-focus circles of light produced before and behind the focal point there are no meaningful differences. After joining this fact with high resolution presented by the tested lens up from the maximum relative aperture you are able to say that there are no problems whatsoever with correction of spherical aberration.
| A7R V, f/2.0, before | A7R V, f/2.0, after |
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