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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 : Camera Lenses : Electronics
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Sigma Photo 17-50mm f/2.8 EX DC OS HSM (Canon mount) Wide-angle zoom lens for APS-C sensor SLR cameras at Crutchfield
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Amazon.com : Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Canon Digital DSLR Camera : Camera Lenses : Electronics
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