Request InfoTempotec Optics Co. Ltd.Tempotec Optics Co. Ltd. now fabricates colored glass filters of various types: the cutoff, which blocks the short wavelength by absorption and transmits the long wavelength; the selective absorption, which transmits or absorbs one or several wavelengths; and the neutral density version, which provides a similar level of absorption for the full visible wavelength range. The filters are available in circular or rectangular shapes up to 200 mm in size. 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