Changchun Positive Optics Co.,Ltd. is a leading IS09001 Optics Manufacturer and Supplier in Changchun, Chinese optics foundation. We are dedicated to manufacturing high precision optical windows, spherical lenses, aspherical lenses, assembly lenses, prisms, filters, mirrors, dome, silicon wafer, etc over 10 years. They are well used for imaging, laser, medical, industrial, defense and astronomy.