The mechanical device inside a lens that controls the aperture.
A ring or plate with a hole in the center, the size of which controls the amount of light entering the camera. An adjustable diaphragm in a lens enlarges or reduces the size of the hole, or aperture, thereby permitting more or less light to pass through the lens to the film or digital sensor.
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Lens opening. A perforated plate or adjustable opening mounted behind or between the elements of a lens used to control the amount of light that reaches the film. Openings are usually calibrated in f-numbers.
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A series of metal blades that can be manipulated to form a larger or smaller opening through which the light is admitted.
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An adjustable deviceinside the lens which is similar to the iris in the human eye; comprised of six orseven overlapping metal blades; continuously adjustable from wide open to stopped down ; controls the amount of light allowed to pass throughthe lens and expose the film when a picture is taken; a]so controls the amount ofdepth of field the photograph will have; in lenses designed for single-lens reflexcameras, there are basically two types of diaphragms: Lens opening. A perforatedplate or adjustable opening mounted behind or between the elements of a lens usedto control the amount of light that reaches the film. Openings are usually calibratedin f-numbers. The more blades used will have a more natural and rounded spots.There are two typesof diaphragms:Automatic: The mostpopular type; controlled by a single aperture ring; during viewing and focusing,the diaphragm remains wide open, allowing the maximum amount of light to go to theviewfinder for a bright and easy-to-focus image; at the instant of exposure, it stopsdown automatically to a particular aperture and then reopens to full aperture immediatelyafterward.Manual Preset: Usedin some specific lenses like, PC-Nikkorlenses for Nikon for instance; controlled by two separate rings; the preset ringis first set to the desired aperture, then the aperture ring is rotated to stop downthe diaphragm manually for metering or prior to taking pictures.
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The adjustable aperture of a lens, which controls the amount of light passing into the camera and may be in front of, within or behind the lens.
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The technical name for the lens aperture that is made from overlapping blades. .
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