#aperture  a device that controls amount of light admitted
  supertype:  #regulator  any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
  part of:  #photographic_camera__camera  photographic equipment consisting of a lightproof box with a lens at one end and light-sensitive film at the other
  part of:  #telescope__scope  a magnifier of images of distant objects

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