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Iris Diaphragm

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iris diaphragm [′ī·rəs ′dī·ə‚fram]
(anatomy)
iris
Iris Diaphragm 

a type of stop that is often used in photographic lenses and other instruments to adjust the brightness of the image and to vary the depth of field. It consists of thin, opaque, crescent-shaped vanes that overlap one another, thus forming an approximately circular opening. By moving the stop ring on the lens or a lever connected to it, all the vanes are turned simultaneously, so that the objective’s opening (aperture ratio) is varied smoothly.
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The changing light level causes a change in the current induced into a minute coil, which in turn causes movement in the Iris diaphragm.
Glossary of Terms (D - L) - CCTV by Eleanor Ramsay / Computers and Internet community
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.
Microscopes: end-user ergonomics by Medical Laboratory Observer
A trial 'Sputnik' was fitted with a Mucon Iris Diaphragm Valve operated by a 'Teleflex' remote operator fitted to the side of the IBC, with a flexible cable linking the valve control handle to the specially adapted valve.
Stop, flow, quick, quick flow!. (News & Installations) by Food Trade Review
 
 
 
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