The ET-ELT20 2.8-4.6:1 Zoom Lens from Panasonic is designed for use with Panasonic's PT-EZ570, PT-EZ570L, PT-EW630, PT-EW630L, PT-EX600, PT-EX600L, PT-EW530, PT-EW530L, PT-EX500 and the PT-EX500L projectors. The lens makes it possible to vary the projection distance by changing the focal distance.