The Tokina 50mm f 1.4 Opera FF Lens with Canon EF Fit is the debut premium lens in Tokina's new opera series for high-performance full-frame DSLR cameras. The lens incorporates a high-speed ultrasonic motor for near-silent operation, new ELR lens coating technology, advanced weather sealing, & a 9-blade, round-shaped diaphragm for naturally beautiful bokeh.