Panasonic ET-EMW400 Zoom Lens enables you to vary the projection distance by adjusting the focal length. The lens offers a focal range of 15.3-21.1mm and an aperture range of f/1.84-2.24 providing a throw ratio of 0.69-0.951 in 1610 or 169 mode and 0.83-1.151 in 43 mode. Designed for use with PT-MZ16K PT-MZ13K and PT-MZ10K LCD laser projectors