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SIGMA 10-20mm F3.5 EX DC HSM Super Wide Angle Zoom Lens for Canon EF Mount APS-C | eBay
Sigma 10-20 mm f/3.5 EX DC HSM review - Pictures and parameters - LensTip.com
Amazon.com : Sigma 10-20mm f/3.5 EX DC HSM ELD SLD Aspherical Super Wide Angle Lens for Canon Digital SLR Cameras - International Version (No Warranty) : Electronics
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Sigma EX 10-20mm f4-5.6 HSM EX DC Wide Angle Zoom Lens For Nikon DX