This interchangeable zoom lens is specifically engineered for compatibility with EIKI's LC-XT3, LC-X5, and LC-X5L series of large venue projectors. It provides a long throw ratio (variable depending on the exact projector model) typically associated with large auditoriums, theaters, or lecture halls. The "extra bright" designation highlights its design to maximize light transmission from the projector, ensuring the projected image maintains exceptional brightness and clarity even over long distances. The zoom feature allows for precise image size adjustment without the need to physically reposition the heavy projector unit. Its high-quality optics ensure minimal distortion and professional-grade image reproduction.