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Infra-red cameras ( for use at night and with special film) have been used for spy and detective applications since the interwar (20"s and thirties) period . Also useful for nature watching. Some have special IR sights that fan out like flashlight reflectors. these closely duplicate what the camera sees on the lens but are subject to some parallax. The ALPA type with special viewfinder looks like a piece of spy equipment, which it is and was. They are made in Switzerland. On the other hand the modern auto-focusing Nikons use Infra red beams ( invisible to naked eye) for focusing purposes but these are not Infra-Red cameras per se. Observe the Red Line.

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