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Sigma mm f563 DG OS HSM Lens Review by Richard Peters 10 August 11 This isn't the opening phrase you'd expect to hear a lens review start with, but here goes Initially, I wasn't overly enthusiastic about trying out the SigmaThe Sigma mm f/563 is optically superb, but feels gritty mechanically as do most Sigma lenses Sigma is a discount brand;Indeed it's one of only two stabilized telephoto zoom lenses reaching 500mm focal length, the other being Sigma's own mm 4563 DG OS HSM The mm is available for Canon, Nikon, Sigma, Sony and Pentax mounts Sigma Dg 150 500mm F5 6 3 Apo Hsm Os For Canon Ebay Sigma 150-500mm f5 6-6 3 apo dg hsm os