The Hoya R72 is an infrared cutoff filter designed to pass only wavelengths above 740nm, for use with infrared film or infrared-converted digital cameras. This filter will not give you infrared effects on standardfilm: it will just give you a blank roll. You can try it on an unconverted digital camera- sensors loooove infrared- but exposures will be long. However, if you use infrared film (like Rollei IR) or your digital camera is sensitive enough, this filter will give you some pretty swell IR effects. For 58mm filter threads.