The NP17ZL 1.25 to 1.79:1 Short Throw Zoom Lens with Lens Shift and Lens Memory from NEC is one of six optional lenses available (in addition to the standard lens) for the NEC NP-PX700W/PX750U/PX800X, NP-PX700W2/PX750U2/PX800X2, NP-PX803UL-BK/PX803UL-WH, and NP-PX1004UL-BK/PX1004UL-WH projectors. It is designed to support a variety of specific installation environments, such as conference rooms, halls, and exhibitions. The lens is easily installed by end users and doesn't require any special tools.1.25 - 1.79:1 Motorized Short Throw Zoom Lens (lens shift) w/Lens Memory for the NP-PX803UL-BK/PX803UL-WH and NP-PX1004UL-BK/PX1004UL-WH projectors