This Panasonic ET-DLE250 Power Zoom Lens adds flexibility for presentations given in large venues. Use the lens when the projector needs to be positioned far away from the screen but large image size needs to be maintained. The zoom feature allows a variety of projector distances while keeping image size consistent. For PT-D6000 and PT-D5700 projectors 33.9-53.2mm focal length 2.5-4.0:1 throw ratio