The Panasonic ETD75LE8 Zoom Lens features a 8.0 – 15.0:1 throw ratio and a 154 – 289mm focal Length. It offers increased projector position versatility by increasing screen-to-projector distance, while maintaining an f-stop of 2.5 – 2.7. This zoom lens is an ideal solution for larger venues, such as conference centers, trade shows, lecture halls, etc.; anywhere a long throw distance is required.