420MM-800MM TELEPHOTO ZOOM LENS ： The zoom range is 420mm-800mm and the maximum aperture in the zoom range is f/8.3-16, which greatly expands the camera's perspective and allows the photographer to shoot professional shots from considerable distances. Wide and comfortable focus ring, even and soft damping, remarkable feel. PROFESSIONAL PREMIUM OPTICAL LENS ： The lens optical properties eliminate glare and reduce aberrations, resulting in a clear and bright lens each time. Multilayer MC coating on optical glass. support 4 pieces 2 group Lens Structure, Full Frame, All manual focus Mode and aperture priority mode linkage metering. OUTDOOR TELEPHOTO PHOTOGRAPHY ： Suitable for shooting subjects that photographs cannot get close to (such as sports matches, wild animals, long-distance close-up, etc.) T2 MOUNT COMPATIBILITY ： T2 mount supports adapter ring to for for for Minolta, for for Pentax, for and other DSLR cameras. MANUAL MODE ： Screw the lens onto the adapter ring and connect to the camera body when shooting. The camera dial is set to M manual mode, can change the exposure through shutter speed or ISO. Some camera can realize automatically expose, and use AV mode shooting depending on the camera's functions.