• A device for producing photographic images. Most optical telescopes are used with a camera of some kind and many, like Schmidt telescopes, are cameras only. Photographic methods completely altered astronomy in the 19th and early 20th centuries, mainly because photographic exposures can be collected over many hours while the eye can only collect images over a very short period, allowing far more detail to be obtained. Film also provides a permanent record. The world of astronomical recording is now being revolutionised again by the move to digital data recording on tape and discs, and by charge-coupled devices (CCDs), which allows computer processing of data as received Cameras used in astronomy are at the edge of the technology, sharing with espionage the fastest films, the longest exposures and demands for information to be gathered in infrared as well as visible wavelengths.
  • A device which converts images into electric signals.
  • A device that converts images formed by lenses into electric signals. A photosensitive surface in the contained camera tube serves as the transducer which converts the optical image into electric video signals suitable for broadcasting, recording, or the like. Also known as TV camera, video camera (1), or telecamera.
  • A device which focuses light from a viewed image onto a light-sensitive material, such as film, so that an image is recorded.

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