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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 : Tamron SP 17-50mm F/2.8 XR Di-II VC LD Aspherical for Canon APS-C Digital SLR Cameras (6 Year Tamron Limited USA Warranty) : Camera Lenses : Electronics
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