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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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Amazon.com : Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Nikon Digital DSLR Camera - International Version (No Warranty) : Electronics
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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
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Sigma 18-50mm F2.8 DC DN: hands-on with the lens that wants to replace your kit zoom: Digital Photography Review
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