 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. ==iris diaphragms versus other types== thumb|nine-blade iris thumb|pentacon 2.8/135 lens with 15-blade iris  a natural optical system that has a diaphragm and an aperture is the human eye. the iris is the diaphragm, and the opening in the iris of the eye (the pupil) is the aperture. an analogous device in a photographic lens is called an iris diaphragm. in the early years of photography, a lens could be fitted with one of a set of interchangeable diaphragms , often as brass strips known as waterhouse stops or waterhouse diaphragms. the iris diaphragm in most modern still and video cameras is adjusted by movable blades, simulating the iris of the eye. the diaphragm usually has two to eight blades, depending on price and quality of the device in which it is used. straight blades result in polygon shape of the diaphragm opening, while curved blades improve the roundness of the iris opening. in a photograph, the number of blades that the iris diaphragm has can be guessed by counting the number of spikes converging from a light source or bright reflection. for an odd number of blades, there are twice as many spikes as there are blades. in case of an even number of blades, the two spikes per blade will overlap each other, so the number of spikes visible will be the number of blades in the diaphragm used. this is most apparent in pictures taken in the 
Optical_devices Photography_equipment