Sigma 50-150 mm f/2.8 APO EX DC OS HSM
5. Chromatic and spherical aberration
Chromatic aberration
The tested lens doesn’t have any serious problems with the longitudinal chromatic aberration. As you can see in the photo below defocused images are characterized by only residual colouring so on real life photos the problem will be difficult to notice.
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When it comes to the lateral chromatic aberration the situation is similar to that of its longitudinal version. At the extreme focal lengths the values are on a border between low and medium levels, at 100 mm the aberration is completely imperceptible. The overall assessment in this category is certainly good.
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Spherical aberration
The Sigma 50–150 mm OS doesn’t have any problems with the spherical aberration either. You can’t notice any ‘focus shift’ effect and the circles of light, made by defocusing light points, are similar in front of and behind the focus. Here it would be difficult to find anything to complain about either - the tested lens could be only praised.
