iris diaphragm
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.
Origin of iris diaphragm
1- Also called iris.
Words Nearby iris diaphragm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use iris diaphragm in a sentence
Rack the condenser down slightly and cut down the aperture of the iris diaphragm so that the light, although even, is dim.
The Elements of Bacteriological Technique | John William Henry EyreThey are also fitted with indicator for registering each exposure as made and iris diaphragm.
Kodaks and Kodak Supplies, 1914 | Canadian Kodak CompanyThe simplest way of achieving this is by means of what is called an iris diaphragm.
Practical Cinematography and Its Applications | Frederick Arthur Ambrose TalbotTo illustrate the functions of the iris diaphragm we will take the Williamson instrument.
Practical Cinematography and Its Applications | Frederick Arthur Ambrose TalbotBy the aid of the iris diaphragm the diameter of the aperture may be varied from approximately ⅗ to ⅛ of an inch.
Practical Cinematography and Its Applications | Frederick Arthur Ambrose Talbot
British Dictionary definitions for iris diaphragm
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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