Use the Sigma EX DC HSM 10-20 mm f/3.5 Wide-angle Zoom Lens with Canon crop sensor DSLR cameras & enjoy more creative options for architectural & outdoor shots. Great for low-light & indoor shots Able to maintain a maximum aperture of f/3.5 through the full zoom range, the Sigma EX DC HSM 10-20 mm f/3.5 Lens will help you achieve better photos in dim conditions or if you're shooting indoors at full extension. Because of its wide-angle view, the lens is particularly suited to taking photos of architecture & landscapes, whether you're outside or within the structure. Higher-quality images Take sharp photographs with enhanced contrast across the full zoom range thanks to super multi-layer coating, which also minimizes ghosting & flare. The Sigma 10-20 mm f/3.5 Wide-angle Zoom Lens features with two ELD (Extra Low Dispersion) & one SLD (Special Low Dispersion) glass elements to counteract colour imbalances & correct for distortion & astigmatism. Autofocus is fast & quiet thanks to a Hyper Sonic Motor, & you'll enjoy full-time manual focus override by rotating the focus ring, putting you in control at all times. Front lens rotation is eliminated by an internal focusing system, so you can use the included petal-type lens hood to cut out unwanted light for cleaner shots. Capture wider scenes & subjects confidently with the Sigma EX DC HSM 10-20 mm f/3.5 Wide-angle Zoom Lens for Canon DSLRs.