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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
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Amazon.com : Sigma 17-50mm F2.8 DC OS HSM Large Aperture Standard Zoom Lens for Sony Digital DSLR Camera : Camera Lens Accessories : Electronics
Re: Sigma 17-50mm F2.8 EX DC OS: Sony Alpha / NEX E-mount (APS-C) Talk Forum: Digital Photography Review
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Amazon.com : Sigma 17-50mm F2.8 EX DC Large Aperture Standard Zoom Lens for Sony Digital DSLR Camera : Digital Slr Camera Lenses : Electronics
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