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The Sigma AF 50mm f/2.8 EX macro DG is an excellent lens without any significant optical flaws. Compared to the Canon EF-S 60mm f/2.8 USM macro it shows less vignetting at wide-open aperture – other than that both lenses perform quite similar. Mechanically the Canon has an edge though thanks to a fast USM AF drive combined with a true IF design (constant length). However, the Sigma is earns some points due to its lower price tag and a more future-proof full-frame design. As such it can be highly recommended. READ FULL REVIEW