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Field iris diaphragm function8/30/2023 This mechanism allows the adjustment of the size of the hole (which assumes a polygonal shape). ![]() ![]() In photographic objectives, the aperture diaphragm consists of thin plates hinged on an external double ring. More often, the aperture function is performed by a lens or a component of the optical system (lens or mirror), whose edge is equivalent to the disk perforation. Physically, it can be a cardboard disk with a central hole, placed on the objective of a telescope, or-for some Galilean telescopes-on the iris of the observer's eye. Diaphragm types are classified by function:Īperture diaphragm (or stop): determines the size of the opening of the optical system (linear aperture). The rays passing through the hole in the diaphragm will form the image, while the intercepted rays will not. Opaque screen perforated in the center to limit the aperture of a lens or optical system by regulating the entry of the beam of light.
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