Cokin P Series Infrared 89B Filter
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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: once the picture is shot, you must "un-saturate" your image on your computer, in other words transfer it to grey levels.