Sigma 12-24mm f/4.5-5.6 EX HSM DG AF Review Round-Up
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Get information and user reviews for this lens from Amazon: Sigma 12-24mm f/4.5-5.6 EX DG IF HSM Aspherical Ultra Wide Angle Zoom Lens for Canon SLR Cameras
Photo Zone
The Sigma AF 12-24mm f/4.5-5.6 EX HSM DG is the most extreme full format ultra-wide zoom lens around and it is still a “mainstream” ultra-wide lens when used on APS-C DSLRs. If you’re looking for a future-proof “duo-format” lens in this class – well, here it is. However, there’re a couple of further good arguments in favor of the lens. In the APS-C scope the resolution is very high and even throughout the tested aperture and focal length range and as such more harmonious compared to dedicated APS-C zooms which tend to suffer from edge problems. Distortions are extremely well controlled for a lens in this class and vignetting is generally not a problem except maybe at 12mm @ f/4.5. The only significant issue are lateral CAs at and below 17mm – you better shoot RAW files and correct the issue in your RAW converter, otherwise CAs are too extreme. The build quality of the Sigma is excellent and the fast and near-silent HSM (ultrasonic) AF drive is a welcome feature. The price tag of the lens is fairly moderate in relation to what you get for your bucks. Highly recommended … if you can get a good sample (the tested sample in Canon mount wasn’t quite as good). “¦ READ FULL REVIEW