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Amazon.com : Sigma 120-400mm f/4.5-5.6 AF APO DG OS HSM Telephoto Zoom Lens for Canon Digital SLR Cameras : Digital Slr Camera Lenses : Electronics
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Sigma 120-400 mm f/4.5-5.6 APO DG OS HSM review - Build quality and image stabilization - LensTip.com
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