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Sigma 50-500 mm f4.5-6.3 APO DG OS HSM Canon mount lens review: Modest price, good performance - DXOMARK
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Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Ultra Telephoto Zoom Lens for Pentax Digital DSLR Camera : Slr Camera Lenses : Electronics - Amazon.com
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Sigma Photo 50-500mm f/4.5-6.3 (Nikon mount) Super telephoto zoom lens for full-frame and APS-C sensor SLR cameras at Crutchfield
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