Definition: (1) Detector of radiant energy. * May include entire system including the necessary optical components and controlling circuitry. * E.g. CCD, light-meter, infra-red range-finder, flash-detector in automatic flash-unit, etc. (2) Detector designed to register a change e.g. to detect whether a camera is being held to take a portrait or landscape format shot; to the focus status of an image.

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