This Sanyo Powered Short Throw Zoom Lens adds flexibility for rear projection installations and setups that require large images with close proximity to the screen. The zoom feature allows a variety of projector distances while keeping image size consistent. Compatible Projectors: Panasonic PT-D7000, Panasonic PT-DW7000, Panasonic PT-D10000, Panasonic PT-DW10000. Throw to Screen Width Ratio! The throw to screen width ratio for 4:3 projectors is: 1.0:1 (wide); 1.2:1 (tele), The throw to screen width ratio for 16:9 projectors is: 0.9:1 (wide); 1.1:1 (tele).