("Infrared filter" may refer either to this type of filter or to one that blocks infrared but passes other wavelengths.) Film is usually sensitive to visible light too, so an infrared-passing filter is used this lets infrared (IR) light pass through to the camera, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red). Wavelengths used for photography range from about 700 nm to about 900 nm. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. In infrared photography, the film or image sensor used is sensitive to infrared light. Taken from a passenger airplane within seconds apart using a Sony H-9 Digital camera. Infrared (900 nm LP) Aerial Photography of Old Hickory Lake, Tennessee.
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