If it is small, it is also called a pinhole. In the simplest case, a diaphragm is a blackened metal plate with a circular hole. The role of a diaphragm in an imaging system is explained in the article on imaging with a lens. In other cases, they may act as aperture stops, reducing the amount of light getting through a system. If they limit the field of view of an instrument, they are called field stops. due to a black coating.ĭiaphragms are also called stops, because they stop the light passage in some regions. Typically, a diaphragm is quite thin, and its non-transparent parts are often absorbing, e.g. Some of the latter can electrically controlled. in photographic objectives.ĭiaphragms may have a fixed opening diameter, but others have a variable opening diameter ( iris diaphragms). They act as intentionally introduced optical apertures, e.g. How to cite the article suggest additional literatureĭiaphragms are circular (or approximately circular) openings, through which light can travel. Using our ad package, you can display your logo and further below your product description.ĭefinition: circular (or approximately circular) openings through which light can travel
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