An infrared filter is a filter to remove visible light and only pass infrared light in different wavelenghts. These are mainly used in infrared photography.

Filter products

• The Kodak Wratten 87, 87A, 87B, 87C
  • Inexpensive gelatine filter.
  • 87A and 87B are no longer produced.
  • 87 starting at 750nm, 87C at 800nm, 87B at 850nm, 87A at 950nm

• The Hoya R72
  • High quality filter starting at 720nm, which includes some visible light.

• The Hoya RM90
  • High quality filter starting at 900nm

• The Hoya RM100
  • High quality filter starting at 1000nm

• The M&K 1000
  • High quality filter starting at 1000nm

• The M&K 093 and 095
  • starting at 830nm

• The Home Made Filter
  • There has been several reports that using exposed and developed film works as an infrared filter.
  • The theory is that the film goes jet-black thus blocking visible light but allowing infrared to pass.
  • The home-made filter typically begins transmission at around 710-730nm