Aperture is controlled by what in the camera?

Question

anonymous · Answer

Typically, a device called a "diaphragm" is used to control the aperture setting. It looks like an iris made of metal shutters. Modern cameras control them elrctronically, older cameras (as well as professional lenses) allow manual control

anonymous · Answer

The aperture is a lens opening and it is either set manually by the photographer or the camera, in an automatic setting, sets it. In low light situations the camera determines that a large aperture, such as 2.8 is necessary, while outside, a smaller aperture, such as 16, might be selected. On fully manual 35mm cameras, the photographer selects the aperture via a ring on the lens, closest to the body of the camera. ( http://answers.yahoo.com/question/index?qid=20080108034653AA5Gpeo)