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
Infrared photography is of interest to the amateur and commercial photographer and to scientists and technologists because it produces images that are not possible with conventional photographic films.
In infrared photographs made outdoors from the ground or from the air, grasses and the foliage of deciduous trees appear white because of the high near-infrared transmission characteristic of green chlorophyll and the high infrared reflectance of the underlying cellulosic structure of these subjects.
Infrared photographs have been used for the construction of charts, the study of sandbars and silting of navigable channels, the control of erosion and pollution, the charting of currents, and the study of marine life.
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