The Sigma AF 50mm f/1.4 EX DG HSM ART is a versatile standard lens designed for Nikon F, Canon EF, and Sony/Minolta Alpha mounts. A standout feature of this model is the support for manual focus adjustment via an optional USB dock. The lens is equipped with a Hyper Sonic Motor for fast and quiet autofocus, all housed in a robust 815-gram body measuring 85x100 mm, with a 77 mm filter thread. With a fixed focal length of 50 mm, the 9-blade diaphragm can achieve a maximum aperture of f/1.4.