Sigma A 50 mm f/1.4 DG HSM
11. Summary
- stylish casing of good quality,
- sensational image quality in the frame centre,
- very good image quality on the edge of the frame,
- slight longitudinal chromatic aberration,
- excellent correction of lateral chromatic aberration,
- lowest distortion level in this class of equipment,
- good correction of spherical aberration,
- moderate astigmatism,
- silent and quick autofocus in most of cases,
- nice appearance of defocused images,
- rich accessory kit,
- excellent price/quality ratio.
Cons:
- problems with autofocus when the lens is attached to the Canon 1 Ds MkIII,
- coma level in the corners of full frame could have been lower.
The list of advantages of the tested Sigma is really impressive; add to it the fact that it can compete on equal terms with the Zeiss Otus, a device four times as expensive, and in some categories (e.g. sharpness on the frame edge, lateral chromatic aberration, distortion or vignetting) it even prevails over it. Those arguments are so strong that we didn’t have any qualms about giving the Sigma our “Editors Choice Award” badge, even though it had a slight coma slip-up during our test and its autofocus performance on the EOS 1 Ds MkIII was patchy.
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I admit I am waiting impatiently for the next Sigma launches in that segment. I think any model featuring such a great price/quality ratio like the 1.4/35 or the 1.4/50 lenses, no matter whether with 1.4/24, 1.8/135 or 2.8/300 parameters, will find a lot of buyers.
