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Amazon.com : Sigma 12-24mm f/4.5-5.6 EX DG IF HSM Aspherical Ultra Wide Angle Zoom Lens for Canon SLR Cameras : Camera Lenses : Electronics
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Amazon.com : Sigma 12-24mm f/4.5-5.6 AF II DG HSM Lens for Nikon Digital SLRs : Digital Slr Camera Lenses : Electronics
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