iris diaphragm definition

  • noun:
    • A circular unit with a variable diameter, commonly used on digital cameras to regulate the actual quantity of light accepted to a lens.
    • diaphragm consisting of slim overlapping dishes which can be modified to change the diameter of a central orifice
  • others:
    • a variable diaphragm, similar to the iris for the attention in its action, by which the diameter of an approximately circular opening may be controlled, for regulating the aperture of a lens; it is made from several movable slim curved dishes fastened at regular periods all over within a ring, the jobs that are simultaneously adjusted by just one knob on the exterior of this lens. It is used in cameras and microscopes.
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