A large-aperture 50 mm prime lens is a must-have for serious full-frame camera users, and the Sony FE 50mm f/1.8 Lens is an excellent, affordable choice. The optical design is state-of-the-art for high image quality, and the large f/1.8 maximum aperture can produce gorgeous background bokeh. On APS-C format E-mount bodies it provides equally high quality with an equivalent focal length of about 75 mm.