Infrared filter
|
|
An infrared filter is a filter to remove visible light and only pass infrared light in different wavelengths. 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