The lens boasts the brightness of the largest aperture in its class. Its 9th element is a ground aspherical lens that thoroughly eliminates spherical aberration and distortion. It achieves extremely sharp, faultless picture quality only possible with a single focal length lens. A floating mechanism maintains the lens’s superior image quality from infinity to the closest shooting distance of 0.3m / 1ft. The non-rotating filter mount provides easy operability with circular polarizes and other types of filters.