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Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF vs Sigma 17-50mm F2.8 EX DC OS HSM Detailed Comparison
Re: Anyone switch from Tamron 17-70 to Sigma 18-50?: Sony Alpha / NEX E-mount (APS-C) Talk Forum: Digital Photography Review
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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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