The Sony FE 70-200mm f/4.0 G OSS Lens is a full-frame E-mount lens with a short to medium telephoto zoom range with an equivalent focal length of 105-300mm on APS-C cameras. It features a constant aperture of f/4.0 for good low-light capabilities at any focal length and smooth out-of-focus elements. This makes it useful for portraits and sports photography where you want to separate the subject from the background.For optical quality, the lens features numerous specialized elements, including Super ED and Advanced aspherical elements. These elements reduce the impact of aberrations and distortion for high resolution imaging. The lens is also benefited by the use of Nano AR coatings that reduce the effects of flaring. It even has dust- and moisture-resistant construction for use in less than ideal weather conditions.During automatic shooting, the 70-200mm lens uses a Dual Linear Motor Autofocus System to achieve quick, precise focus and has focus hold and limiter options for improving performance in certain situations. There is also Optical SteadyShot image stabilization for maintaining sharpness at long focal lengths or long shutter speeds. Additionally, there is a removable tripod collar and a lens hood.