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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
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