Sigma A 50 mm f/1.4 DG HSM
5. Chromatic and spherical aberration
Fast lenses usually experience a lot of problems with the longitudinal chromatic aberration correction; Sigma with their 1.4/35 model has proven, however, that even if the standards are raised high they can cope quite well. The same can be said about the A 50 mm f/1.4 DG HSM lens – its constructors did equally good job and corrected that aberration well. You can notice slight cast in out of focus images (yellow-green behind the focus and reddish before it) but that effect is slight and it doesn’t change our high assessment in this category.
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You can describe the lateral chromatic aberration in similar terms. No matter what detector and what aperture you employ, that aberration remains imperceptible. Here the Sigma fares even momentarily better than the Otus 1.4/55 which results, amounting to over 0.07%, were low but still higher than those of the Sigma.
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Spherical aberration
The lens doesn’t show any „focus shift” effect or delicate misting of the image by f/1.4 which are characteristic for badly corrected spherical aberration. Also the appearance of defocused light points in front of and behind the focus doesn’t worry us at all. The images aren’t the same because the one in front of the focus has slightly darker edges and the one behind the focus - a delicate rim on the edge but those differences aren’t very distinct. As a result the spherical aberration correction can be described as good and proper.
