Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Canon EF with Cleaning Kit, Tripod, 32GB Memory, Filters, and Padded Lens Case Bundle - Newegg.com
Amazon.com : Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Canon Digital DSLR Camera - International Version (No Warranty) : Electronics
Used Sigma 17-50mm f/2.8 EX DC OS HSM - Nikon Fit | MPB
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Sigma 17-50mm f/2.8 EX DC HSM FLD Large Aperture Standard Zoom Lens for Sony Digital DSLR Camera - Walmart.com