The FUJINON UA107x8.4 BESM AF is the world's first 4K box lens equipped with autofocus and was designed for use during live indoor broadcasting, sporting and other large events. The newly developed phase detection autofocus sensor achieves sharp images with a response speed as fast as 0.5 seconds and boasts outstanding capabilities when tracking a moving subject. The lens also features a proprietary image stabilization mechanism and a 107x ultra-magnification zoom. It allows high-quality 4K video to be shot with ease, making it suited to covering sports, concerts, and other live events.