Canon ef 50mm f14 usm the ultimate mixture of versatility and image quality with its fast maximum aperture and rapid focusing system the compact high performance ef 50mm f14 usm standard lens can be relied on for superb performance in any field of photography fast f14 aperture standard 46 angle of view usm focus motor with full time manual focus override 45cm closest focusing distance aspherical lens element 58mm filter size versatile compact standard lens design