This large aperture prime lens with a standard focal length of 50mm is ideal for digital cameras. This lens has superior peripheral brightness and provides high contrast image even at the maximum apertures. It is ideal for several type of photography such as portrait, landscape and reportage. The molded glass aspherical lens elements provide excellent correction of chromatic aberration and ensure superior optical performance. The fast F1.4 aperture and rounded 9 blade diaphragm creates an attractive blur to the out of focus areas. This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF as well as full-time manual focus override. more info