iris diaphragm(redirected from Diaphragm (optics))
Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to Diaphragm (optics): substage condenser
A circular device with a variable diameter, commonly used on cameras to regulate the amount of light admitted to a lens.
(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
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.
Switch to new thesaurus
|Noun||1.||iris diaphragm - diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening|