Meniscus Lens ZnSe - Model #: LMZ-1550-ET7.4 1.50"Ø X .291" (7.4mm) E.T. EFL = 5.0" @ 10.6µm Coated: AR/AR @ 10.6µm Replaces: Trumpf® P/N: 0088114, II-VI®: 406294