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The infrared filter is used to block visible light, only through infrared ray, take pictures out like black and white photos, but has a unique color again.
This IR filter can block all visible light under 720 nm. 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.
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 photos.