Excellent for video projection applications. Ideal for home theaters or where a variety of image formats are projected. View from "Letterbox" to "NTSC" format or from "HDTV" to "NTSC" format with concealed-in-the-ceiling screen. Second motor lowers and raises black masks into position to convert screen to different format. Patented in-the-roller motor mounting system for quiet operation. Unique "step-back" masking design eliminates shadows. Screen except screen is tensioned for an extra flat surface for optimum image quality when using video or data projection. Tab guide cable system maintains even lateral tension to hold surface flat while custom slat bar with added weight maintains vertical tension.