The Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom is a super-wide angle lens with a maximum aperture of f3.5 throughout the entire zoom range, ensuring high image quality. The maximum aperture of f/3.5 is allows enough light in to make it a great choice for indoor shooting as well as landscapes and creative portraiture. With its wide angle view from 102.4 degrees, this lens can empower the photographer to produce creative images with exaggerated perspective. This lens has a Super Multi-Layer coating that coating reduces flare and ghosting. With a HSM (Hyper-Sonic Motor), the lens operates quietly and at high speed in both autofocus and full-time manual modes.