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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

aperture diaphragm

The second adjustable iris diaphragm in an optical system. In the common microscope condenser system, it usually is located beneath the substage condenser on a transmitted light microscope. When the aperture diaphragm is adjusted, the intensity of the light and the angle of the cone of light entering the objective are varied. Also refers to the iris in a camera lens.
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