The 0.8x reducer adopts a quadruplet design and supports a 44mm full-frame image circle. The back focus from the M48 thread is a standard 55mm. The front thread is M841. At the camera end, it is equipped with adapters of three different sizes, M681, M540.75 and M480.75, for convenient connection. At the same time, it has a built-in 2 inch M48*0.75 filter thread, which can be installed and used directly. The entire body is CNC machined, with threaded metal caps on both ends to prevent dust when not in use.