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The optical filter for 8-12 microns spectral range on the base of MCT epilayer grown by Metal Organic Chemical Vapor Deposition (MOCVD) has been investigated. The CdTe mole fraction in CdHg1Te equals x=O.24. The single-layer antireflection coatings for 10 tm peak wavelength have been deposed on the both sides of the filter. Transmission in 8-12 tm spectral range exceeds 70 %. Transmission at 7 im is of4O %, at 6 tm -10 %, at 5 tm -less than 2%.