... Image, or Imax cinema system.Very famouse brand Saint-Gobain glass both side of the filter. Very high transmittance.Very good ... grade glass with high transmittance and rubresistance, imported circular polarized films insidesizes available: 15 x 15cm, 20 x 20cm, 25 x 25cm, 30 x 30 ... , office projectors, school projectors 3D circular polarized projecting filter with glass for projector