Sigma S 500 mm f/5.6 DG DN OS
5. Chromatic and spherical aberration
Chromatic aberration
As many as five low dispersion glass elements undoubtedly bring only positive results – the tested lens doesn't have any problems with longitudinal chromatic aberration. |
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The results we got, no matter what aperture was employed, stay under 0.04% so we can describe them as very low. Good job!
| A7R IIIa, RAW, f/5.6 | A7R IIIa, RAW, f/16.0 |
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Spherical aberration
The tested lens doesn't feature any noticeable 'focus shift' effect or slightly misty images at the maximum relative aperture, both being characteristic features of lack of proper correction of spherical aberration. At the same time that aberration doesn't make itself felt in out-of-focus circles of light we got before and behind the focus. The only thing we managed to notice is a slight difference in brightness when it comes to edges of both circles. It all makes us think that the Sigma S 500 mm f/5.6 DG DN OS doesn't have any problems with correction of spherical aberration.
| A7R IIIa, f/5.6, before | A7R IIIa, f/5.6, after |
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