This filter is for black and white infrared film when you only want to transmit the infrared spectrum and none of the visible spectrum. Filter factor is determined by the film sensitivity. This filter measures 85 x 85mm and fits the Cokin P series holder.
Blocks all visible light up to 650 nanometer
Allows 50 percent of light to 720 nanometer and more than 90 percent of the infrared and beyond
84 mm wide