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iris diaphragm
noun
, Optics, Photography.
- 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.
iris diaphragm
noun
- 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 toiris
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Word History and Origins
Origin of iris diaphragm1
First recorded in 1885–90
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Example Sentences
Rack the condenser down slightly and cut down the aperture of the iris diaphragm so that the light, although even, is dim.
From Project Gutenberg
They are also fitted with indicator for registering each exposure as made and iris diaphragm.
From Project Gutenberg
The simplest way of achieving this is by means of what is called an iris diaphragm.
From Project Gutenberg
To illustrate the functions of the iris diaphragm we will take the Williamson instrument.
From Project Gutenberg
By the aid of the iris diaphragm the diameter of the aperture may be varied from approximately ⅗ to ⅛ of an inch.
From Project Gutenberg
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