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Amazon.com : Tamron SP AF17-50mm F/2.8 Di II LD Aspherical (IF) Lens with hood for Nikon-D DSLR Cameras : Camera Lenses : Electronics
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Amazon.com : Tamron SP Auto Focus 17-50mm F/2.8 XR Di-II LD SP Aspherical (IF) Zoom Lens with Built In Motor for Nikon Digital SLR : Camera Lenses : Electronics
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F2.8 Standard Zoom Lenses for Sony APS-C Cameras Size Comparison: Sony 16-55 vs Tamron 17-70 vs Sigma 18-50
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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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