The cokin infrared filter is for both film and digital cameras with a film cameras the cokin infared filter must be used with infrared colour or infared black white film the cokin infared filter is equivalent to the kodak 89b wratten filter with a spectrum transmission of 50 at 720 nm the distinctive feature of infrared filters is that they filter most of the visible rays and let infrared rays go so as to produce spectacular photographic effects the process in digital is really easy on