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HOYA 49 mm R72 Infrared filter (FH-R72-49)
Infrared Transmitting FiltersInfrared-transmitting filters absorb most of the visible region and transmit the infrared region. They include the R and IR series, which sharply cut off part of the infrared, the RM series, which smoothly and gradually cut them off, and the RT series which band-pass the infrared region. They are widely used in light sources for such purposes as infrared warning systems and night-vision equipment.
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