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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
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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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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