Top features: – Great for low-light and indoor shots thanks to a consistent maximum aperture – High quality images thanks to special elements and coatings – Fast and quiet focusing thanks to the Hyper-Sonic Motor Great for low-light and indoor shots Able to maintain a maximum aperture of f/3.5 through the full zoom range, the Sigma 10-20 mm f/3.5 EX DC HSM 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 and landscapes, whether you’re outside or within the structure. High quality images Take sharp photographs with improved contrast across the full zoom range thanks to super multi-layer coating, which also minimizes ghosting and flare. The lens features with two ELD (Extra Low Dispersion) and one SLD (Special Low Dispersion) glass elements to counteract colour imbalances and correct for distortion and astigmatism.Fast and quiet focusingAutofocus is fast and quiet thanks to a Hyper-Sonic Motor, and 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.