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What (who) is sieve aperture - definition

OPTICS AND PHOTOGRAPHY

Iris (camera); Iris diaphragm; Iris (diaphragm); Aperture diaphragm; Field stop; Diaphragm aperture; Aperture shape; Aperture shape (optics); Diffusion disc; Diffusion disc (optics); Sieve aperture; Sector aperture; Aperture blade; Diaphragm blade; Lens diaphragm

Diaphragm (optics)

In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture.

https://en.wikipedia.org/wiki/Diaphragm_(optics)

Iris diaphragm

·add. ·- An adjustable diaphragm, suggesting the iris of the eye in its action, for regulating the aperture of a lens, consisting of a number of thin pieces fastened to a ring. It is used in cameras and microscopes.

Aperture

HOLE OR OPENING THROUGH WHICH LIGHT TRAVELS

Aperture stop; Aperture Stop; Apertures; Lens aperture; Aperature; Aperture factor; Apature; Optimal aperture; Clear aperture; Aperture (optics)

·noun The act of Opening.

II. Aperture ·noun An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.

III. Aperture ·noun The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.

Wikipedia

Diaphragm (optics)

In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses). The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system.

Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris.

See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm.

https://en.wikipedia.org/wiki/Diaphragm (optics)