The Canon YJ18x9B4 KRS-A SX12 BCTV Zoom Lens is an 18x zoom broadcast lens with a 9-162mm focal range and a bright f/1.8 aperture. It is designed for professional broadcast cameras with a 2/3-inch sensor size and B4 mount. The lens offers smooth zoom and focus control and provides high optical performance for clear, sharp images in various shooting conditions. It features a resin optical design for reduced weight and improved maneuverability, making it suitable for field and studio productions.