Canon EF 50mm f/1.4 USM Lens.

With its fast maximum aperture and rapid focusing system, the compact, high performance EF 50mm f/1.4 USM standard lens can be relied on for superb performance in any field of photography. Gaussian optics, combined with two high-refraction lens elements allow photographers working in all fields to capture crisp, clean images, even wide open at f/1.4. Model number ef 50mm.