Aperture card



a punched-card mounting for microfilmed pages.

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  • Aperture mask

    . a perforated metal plate situated behind the faceplate of a color television picture tube and having holes aligned to insure that each of three electron beams strikes only its corresponding red, green, or blue phosphor dot. noun (television) a perforated metal sheet mounted close to the phosphor-dotted screen in some colour television tubes. The […]

  • Aperture-priority

    of or relating to a semiautomatic exposure system in which the photographer presets the aperture and the camera selects the shutter speed.



  • Aperture ratio

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  • Aperture synthesis

    (in radio astronomy) a technique that combines the inputs of a set of radio telescopes to obtain a greater resolution of images than is possible with a single member of the set. noun an array of radio telescopes used in radio astronomy to simulate a single large-aperture telescope. Some such instruments use movable dishes while […]



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