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Get information and user reviews for this lens at Amazon: Sigma 24-70mm f/2.8 EX DG Macro Aspherical Large Aperture Standard Zoom Lens for Canon SLR Cameras
The Sigma 24-70mm f/2.8 EX DG Lens is a well-built, well-spec’d lens with a decent price. It does not outperform (physically or optically) Canon’s similarly spec’d EF 24-70mm f/2.8 L USM Lens, but it costs less than half as much. The Sigma 24-70mm f/2.8 EX DG Lens’ AF is very loud but reasonably fast (although the noise makes it sound slower). The Sigma 24-70mm f/2.8 EX DG Lens is sharpest at the wide end of its focal length range. At 24/28mm, the 24-70 is very sharp in the center at f/3.2. However, performance gets progressively worse as the focal length is increased. To me, 70mm f/2.8 is not usable on this lens. At 70mm f/4, center performance becomes useable. Corners (1.6x FOVCF corners included) need an extra stop at all focal lengths to become very good – generally becoming very nice at f/5.6. … If the prices were the same, I don’t think anyone would choose the Sigma 24-70mm f/2.8 EX DG Lens over the Canon EF 24-70mm f/2.8 L USM Lens. But, the Sigma is less than half the price of the Canon. And for that reason, many people are willing to overlook the physical and optical quality differences between these two lenses. READ FULL REVIEW