The Sigma 10-20 mm f/3.5 EX DC HSM Wide-angle Zoom Lens produces striking images & gives avid photographers a great range of artistic expression. Ultra wide-angle zoom The f/3.5 EX DC HSM 's wide-angle of view from 102.4° creates a greater freedom of expression simply by rotating the zoom ring. The constant aperture of f/3.5 across the entire zoom range provides bright images, helping photographers check focusing or composition, ideal for architectural, indoor & landscape photography. You can also use the wide-angle lens to create an exaggerated perspective between the subject & background, beautifully emphasising, for example, the breadth of a landscape. Superior image quality Capture stunning, high resolution photos thanks to the two ELD (Extraordinary Low Dispersion) & one SLD (Special Low Dispersion) glass elements, which effectively correct all types of aberrations. The super multi-layer coating also reduces flare & ghosting, providing high contrast images throughout the zoom range. Hyper Sonic Motor Thanks to HSM (Hyper Sonic Motor) the EX DC HSM has a quiet, high-speed Autofocus, with a manual focus override that can be activated by rotating the focus ring. The Sigma 10-20 mm f/3.5 EX DC HSM Wide-angle Zoom Lens for Nikon DSLRs reduces distortion & captures beautifully sharp & high-quality images across the entire zoom range.