✦ 『MC Coating & Triple Ring Locking』 Multi-layer MC coating on optical glass. The optical properties of the lens eliminate glare and reduce aberrations, resulting in a clear and bright lens every time. Triple ring lock for external tripod system. ✦ 『Professional Photography Equipment』 Suitable for taking pictures of subjects that photographers cannot get close (ex. Sports games, wild animals, close-ups from a distance, etc.). Wide and comfortable focus ring, even and soft cushioning, remarkable feeling. ✦ 『Multi-Use』 The T2 bracket supports the adapter ring for / Pentax, and other DSLR cameras. ✦ 『420mm to 800mm』 The zoom range is 420mm to 800mm and the maximum aperture in the zoom range is 1: 8.3 to 16, which greatly expands the perspective of the camera and allows the photographer to take professional pictures from considerable distances. ✦ 『User Guidance』 Screw the lens onto the adapter ring and connect it to the camera housing when recording. The camera dial is set to manual mode M and can change the exposure using the shutter speed or ISO. Some cameras can automatically expose and make the recording in AV mode dependent