It is a bright large-diameter single focal length lens with high-quality open F value 1.4. Of large diameter single-focus lens unique, we are proud of the high imaging performance that satisfies the demand for high resolution and natural blur in the open aperture. And nano Crystal Court, by an optical design that exhibits a corrected excellent depiction force aberrations, in a possible natural depiction infinity to the closest distance without distortion Sharp, it is suitable for, especially landscape, night scene, star of shooting . Furthermore, the mounting of the MF drive mechanism, reduces the time lag MF, was dramatically improved operational feeling of the manual focus upon "M / A" mode.