Zhejiang Crystal-optech Co., Ltd. engages in the research, development, manufacture and sale of optical thin film, light-emitting diode sapphire substrate, reflective materials, automation, and equipment. Its products include optical low pass filters and infrared cut-off filters which are applied in digital cameras, mobile phone cameras, light-emitting diodes and computer cameras. The company was founded on August 2, 2002 and is headquartered in Taizhou, China.