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Amazon.com : Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Canon EF with Cleaning Kit, Tripod, 32GB Memory, Filters, and Padded Lens Case : Electronics
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Zoom lens comparison: Tamron 17-50 f2.8 VC, Sigma 17-50 f2.8 OS / 18-35 f1.8, Canon 17-55 IS USM - YouTube
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Amazon.com : Sigma 17-50mm f/2.8 EX DC OS HSM Zoom Lens for Canon DSLRs with APS-C Sensors + Essential Bundle Kit - International Version (1 Year Warranty) : Electronics
Re: Sigma 17-50mm f/2.8 to replace 3 lenses: Third Party Lens Talk Forum: Digital Photography Review
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Sigma Photo 17-50mm f/2.8 EX DC OS HSM (Canon mount) Wide-angle zoom lens for APS-C sensor SLR cameras at Crutchfield
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