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Amazon.com : Canon EF-S 17-55mm f/2.8 IS USM Lens for Canon DSLR Cameras, Black - 1242B002 : Camera Lenses : Electronics
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Fast zoom lens battle: Canon 17-55 f2.8, Sigma 18-35 f1.8, Tamron 17-50 f2.8 VC, Sigma 17-50 f2.8 OS - YouTube
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Amazon.com : Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) Lens with hood for Canon DSLR Cameras : Slr Camera Lenses : Electronics
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