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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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Tamron B005 SP AF 17-50mm f/2.8 XR Di-II VC LD Aspherical (IF) Lens for Canon EF | JG Superstore | Lazada PH
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Tamron SP AF 17 - 50 mm F/2.8 XR Di II LD Aspherical (IF) for Canon Digital SLR Standard Zoom Lens - Tamron : Flipkart.com
Tamron SP AF XR LD Aspherical IF Di II 17-50mm F2.8 Lens Reviews - Tamron Lenses - Pentax Lens Review Database
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