... circular polarized projecting lens, 3D filters2.for 3D movie projector3.for 3D theater4.avaliable for squar and circle shape5.size: 15 ... 5%, compensation 125nm/138nm11.with high precision optics function.12.For Real D, Master Image, or Imax cinema system.Very famouse ... we also do custom sizes according to customers' requirementsUseage area:Real D 3d theaters, Master Image 3d cinemas, family projectors, ...