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Lens review

Sigma A 12-24 mm f/4 DG HSM

23 October 2016
Szymon Starczewski

11. Summary

Pros:
  • solid and stylish casing,
  • excellent image quality in the frame centre,
  • very good image quality on the edge of the APS-C,
  • sensible image quality on the edge of full frame,
  • lack of longitudinal chromatic aberration,
  • imperceptible lateral chromatic aberration,
  • lack of problems with astigmatism,
  • noticeably lower distortion than that of its rivals,
  • slight coma,
  • low vignetting for the APS-C/DX sensor,
  • silent and accurate autofocus.

Cons:

  • distinct spherical aberration at 24 mm,
  • work against bright light could have been better,
  • impossible to attach classic filters.

I was really curious about the duel between the Sigma and the Canon. Obviously the Canon provides a tad wider focal range and it does so on wide angle, an important feature. On the other hand the Sigma costs $1599 while you have to pay for the Canon $2799. With such a huge difference in prices the results reached by the Sigma should be assessed very positively. Spherical aberration makes it lose in the resolution category at the maximum focal length but it is able to compete with the Canon on equal terms at the shorter end. What’s more, the Sigma is notably better when it comes to lateral chromatic aberration, distortion, vignetting or the performance against bright light. These are very substantial arguments and it seems the Sigma will be able to draw a lot of prospective customers of the more expensive Canon.

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I am also sure it is not the last word of Sigma in this category of lenses – sooner or later we’ll get a device with even more extreme parameters, something close to the model I mentioned in the introduction.