The SLR Hut Sony FE 70-200mm f/4.0 G OSS Lens is a full-frame E-mount lens with short-to-medium telephoto zoom range, and an equivalent focal length of 105-300mm on APS-C cameras. Featuring a constant aperture of f/4.0 for good low-light capabilities at any focal length and smooth out-of-focus elements. It is thus useful for portraits and sports photography, where subject is separated from background.