17-50mm F2.8 EX DC OS HSM | 镜头| SIGMA公司,Sigma 17-50mm f/2.8 OS Image Stabilization EX DC OS HSM Lens for Canon – JG Superstore,Used Sigma 17-50mm f/2.8 EX DC OS HSM - Canon EF-S Fit | MPB,Sigma 17-50mm f/2.8 EX DC OS HSM FLD Large Aperture Standard Zoom Lens for Sigma Digital DSLR Camera : Camera Lenses : Electronics - Amazon.com,Sigma 17-50mm f/2.8 EX DC OS HSM Lens - TRADELECTRONICS | Buy & Sell Electronics in Sydney