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Amazon.com : Sigma 50-200mm f/4.0-5.6 DC IF SLD Optical Stabilized (OS) Lens with Hyper Sonic Motor (HSM) for Canon Digital SLR Cameras : Camera Lenses : Electronics
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For Sale - Sold Sigma 50-200mm f/4-5.6 DC OS HSM for Pentax (Price Reduced Further) - PentaxForums.com
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Amazon.com : Sigma 50-200mm f/4.0-5.6 DC IF SLD Optical Stabilized (OS) Lens with Hyper Sonic Motor (HSM) for Canon Digital SLR Cameras : Camera Lenses : Electronics
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Sigma 50-200mm F4-5.6 DC OS HSM vs Nikon AF-S DX Nikkor 55-200mm f4-5.6G VR Detailed Lens Comparison
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