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Used for shooting with infrared films. The lnfrared film is also sensitive to short wavelengths of the UV and visible spectrum, so you need to filter everything except infrared rays. R72 only passes infrared rays over 720nm. RM90 only passes over 900nm infrared rays. Often used for criminal detection, medical photography, and plant distribution detection. For normal shooting with infrared film or infrared color film, you can also change the contrast and color effect with filters such as Y(K2), O(G), R (25A)