FIELD: indication equipment. SUBSTANCE: invention is related to optical filters used in indicator panels and mounted in front of them to trap electromagnetic waves and cut-off beams of near-infrared spectrum emitted by indicator panel. Optical filter includes filter base and clear conducting film with resistance not more than 3.0 Ohm/sq.cm composed of thin silver films and zinc oxide films which alternate to form multilayer film. Clear film is connected to grounding element manufactured from conducting paste. Technical result of invention lies in transmission by optical filter of visible beams and in entrapment of electromagnetic waves with frequency 30-130 MHz and beams of near-infrared spectrum with wave length 800-1000 nm. EFFECT: low cost, reduced weight and thickness and improved contrast range of filter. 17 cl, 8 dwg
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