#diaphragm.mechanical_device__stop  a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
  supertype:  mechanical_device  mechanism consisting of a device that works on mechanical principles
  subtype:  iris_diaphragm  diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
  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

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