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"
Translations
References in periodicals archive ?
Prydal, "A new customized artificial iris diaphragm for treatment of traumatic aniridia," Contact Lens & Anterior Eye, vol.
The camera's adoption of a seven-blade iris diaphragm further allows users to enjoy natural blur characteristics.
After phacoemulsification and foldable IOL implantation, UBM revealed that the iris diaphragm shifted backward deepening the anterior chamber by approximately 850 [micro]m and 810 [micro]m and widening its angle by approximately 12[degrees] and 15[degrees] in cases of open and close angles respectively.
Mucon iris diaphragm valves provide flow control of powders and granules.
Images were taken with a Leica DC100 digital camera attached to a Leica MZ6 stereo dissection microscope, fitted with an iris diaphragm. Standard illumination was provided from a Leica light source.
Available in monocular, binocular and trinocular models, the instrument comes complete with achromatic objectives (4x, 10x, 40x(S) and 100x(S) oil), wide-field eyepieces, Abbe condenser with iris diaphragm and filter, adjustable built-in, six-volt, 20-watt halogen lamp with variable intensity control, and coarse/fine adjustment with focus stop; an optional phase-contrast attachment is also available.