The NP15ZL 4.7-7.2:1 Zoom Lens from NEC is an accessory lens designed for the NP-PA600X, NP-PA500X, NP-PA550W, NP-PA500U, NP-PA500X-13ZL, NP-PA500U-13ZL, NP-PA550W-13ZL, and NP-PA600X-13ZL projectors. 4.62 - 7.02:1 Manual Zoom Lens (lens shift) for the NP-PA521U/PA571W/PA621X, NP-PA804UL-B/PA804UL-W and NP-PA1004UL-B/PA1004UL-W projectors