The Canon 53.6-105.6mm F2.34-2.81 RS-IL04UL REALiS Pro AV Series Interchangeable Ultra-Long Focus Zoom Lens is a high-resolution projection lens for the REALiS WUX4000, WUX5000, WX6000, and SX6000 Pro AV Installation LCOS Projectors. It is designed to deliver high-quality imagery and installation flexibility, with a wide range of throw distances and other optical performance characteristics to suit the different projection environments.