A photographic diaphragm is a slim opaque structure with an opening or aperture at its center. The diaphragm is used to stop the passage of light, except for the light that passes through the aperture; therefore, it is also called a stop. The diaphragm is put in the lens’ light path, and the size of the opening controls the amount of light that can pass through the lens. The center of the diaphragm’s opening corresponds to the optical axis of the lens structure. Most current-day cameras have an adjustable diaphragm, called an iris diaphragm.
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