Featuring a lightweight and compact design, the YN 50mm f/1.8S DF DSM Lens from Yongnuo is a portrait-length prime designed for full-frame Sony E-mount mirrorless cameras. The lens has a bright f/1.8 design to suit working in low-light conditions and to enable increased control over depth of for isolating subject matter. The optical design incorporates one aspherical element, which helps to reduce chromatic aberrations and color fringing, and a nano multilayer coating has been applied to suppress flare and ghosting for improved contrast in strong lighting conditions. Balancing the optics is a DSM autofocus system, which promotes fast and quiet focusing performance to suit both photo and video applications.