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''Top:'' tree photographed in the near . crossed by a bridge and a dam, between red foliage on left, and blue parking lots and buildings on right.]] In infrared photography, the film or (IR) light pass through to the Camera but blocks all or virtually all of the visible light spectrum (and thus is black). When these or Black And White images with a dreamlike or sometimes lurid appearance. The effect is mainly caused by Foliage (like tree leaves and grass) strongly reflecting and emitting (through Fluorescence ) infrared and thus appearing very bright, while other objects like water turn black. Infrared photography was popular with 1960s recording artists, because of the unusual results; Jimi Hendrix , Donovan and the Grateful Dead all issued albums with infrared cover photos. Infrared photography can easily look gimmicky, but photographers such as Elio Ciol have made subtle use of black-and-white infrared-sensitive film. Many conventional cameras can be used for infrared photography, where infrared is taken to mean light of a wavelength only slightly longer than that of visible light. (Photography of rather longer wavelengths is normally termed Thermography and requires special equipment.) Once the lens on an SLR camera is fitted with a filter that is opaque to visible light, the reflex system becomes useless for both framing and focusing; a tripod may be necessary. With some patience and ingenuity, most film cameras can be used. However, some cameras of the 1990s that used 35mm Film have infrared sprocket-hole sensors that can fog infrared film (their manuals may warn against the use of infrared film for this reason). Other film cameras are not completely opaque to infrared film. Certain infrared-sensitive films may only be loaded and unloaded in darkness, and they require special development. But arguably the greatest obstacle to infrared film photography is the increasing difficulty of obtaining infrared-sensitive film. Digital Camera sensors are sensitive to infrared light, which would interfere with the normal photography by confusing the autofocus calculations or softening the image (because infrared light is focused differently than visible light), or oversaturating the red channel. Thus, to improve image quality, some digital cameras employ infrared Blocker s. Infrared photography is usually not practical with these cameras because the exposure times become overly long, creating Noise and Motion Blur in the final image. Satellite sensors which are sensitive to infrared use a variety of technologies which may not resemble common camera or filter designs. EXTERNAL LINKS
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