iris diaphragm

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iris diaphragm

n.
A circular device with a variable diameter, commonly used on cameras to regulate the amount of light admitted to a lens.

iris diaphragm

n
(Photography) an adjustable diaphragm that regulates the amount of light entering an optical instrument, esp a camera. It usually consists of a number of thin metal leaves arranged so that they open out into an approximately circular aperture. Sometimes shortened to: iris

i′ris di`aphragm


n.
a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system.
[1885–90]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.iris diaphragm - diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central openingiris diaphragm - diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
diaphragm, stop - a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"
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