ABSTRACT
Infrared (IR) photography is the recording of images using IR wavelengths from around 700nm to 1200nm, invisible to the human eye, though visible to some species of animals, including certain species of fish such as goldfish and piranhas. The basic principle of IR photography is to exclude all visible light from the camera, and just allow the IR radiation reflected from the subject to reach the sensor. A range of IR filters are available from various manufacturers, some with very specific wavelength transmittance. IR wavelengths are brought to a different point of focus than visible light, beyond the plane of the image sensor. Light-Emitting Diodes (LEDs) are being increasingly used by photographers, and are available in a variety of wavelengths, including visible and IR, or IR only. Digital IR photographers often like to introduce a halation effect into their images to simulate the infrared film.
