Use for photography with infrared films. * Infrared film is also sensitive to ultraviolet rays and the shorter wavelengths of the visible spectrum so it is necessary to filter out all but the infrared rays * IR850 passes only infrared rays above 850nm * Infrared filter often used in crime detection, medical photography, detection of distribution of vegetation, etc * For photographer, this filter can be used with infrared film or digital photography to get interesting artistic and sometimes creative photos