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Opteka 77mm Circular Polarizing Filter for Sigma 17-50mm f/2.8 EX DC OS HSM Lens | eBay
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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 17-50mm f/2.8 EX DC OS HSM Zoom Lens for Canon EOS Digital - Walmart.com
