Sigma A 105 mm f/2.8 DG DN Macro
5. Chromatic and spherical aberration
Chromatic aberration
The Sigma corrects longitudinal chromatic aberration exceedingly well. Blurry areas don't have almost any traces of unwanted colouring and you don't need to stop the lens down. |
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It's clear that aberration depends weakly on aperture values and it keeps a level of about 0.02% on both types of detectors. Such a value could only be called negligible and it means your photos will be devoid of any influence of that aberration. Once again the Sigma prevails over the Sony 2.8/90 as that lens, near the maximum relative aperture, could have lateral chromatic aberration of 0.07-0.09%.
| A7R II, RAW, f/2.8 | A7R II, RAW, f/16.0 |
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Spherical aberration
In first photos of this chapter it would be difficult to notice any trace of 'focus shift'. Additionally, defocused circles of light don't show anything alarming. The circle we got behind the focus features a tad brighter rim but, fortunately, it is not especially accented and it remains the only thing that might turn your attention in this category.Overall, we don't have any reasons to think that spherical aberration is corrected by the Sigma A 105 mm f/2.8 DG DN Macro in a wrong way.
| A7R II, f/2.8, before | A7R II, f/2.8, after |
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