Panasonic ET-ELT22 Mid zoom lens is designed to be used with a PT-EZ770Z series PT-MZ670 series or PT-MZ770 series projector. It supports either WUXGA WXGA or XGA resolution depending on which projector it is used with and a throw ratio of 2.8 - 4.61. The lens makes it possible to vary the projection distance by changing the focal distance.