Canon's reknowned FDn 50mm f/1.4 is a compact, super-sharp, high-speed all purpose normal lens. Built to professional standards, this lens can be used with respectable results even at its maximum f/1.4 opening. The FD-series lenses can be used for full-aperture metering when mounted on any of Canon SLR models including and after the original F-1, EF and FTb models. Compact, High-speed normal lens for Canon manual focus SLR cameras Filter Size 52mm (Original Optional Lens Hood was BS-52) f/Stop Rangef/1.4-22 Minimum Focus Distance 1.5' (45cm) Angle of View 46 degrees Groups/Elements 6/7 Length 41mm Maximum Diameter 63mm Weight 235g