The Samyang 50mm f/1.4 AS UMC (Canon EF mount) is a manual focus, fast-aperture prime lens designed for full-frame DSLRs, offering a 50mm "standard" focal length suitable for portraits, low-light, and video. It features a bright f/1.4 aperture, 9 elements in 6 groups, 8 aperture blades, a 77mm filter size, and a 0.45m minimum focus distance.