Diaphragm (optics) 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. 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 dev in a
Eye of the Beholder (film) Eye of the Beholder (film) Eye of the Beholder is a 1999 Canadian-British-Australian mystery thriller film that employs magical realism. The film, based on Marc Behm's novel of the same name and a remake of Claude Miller's 1983 French thriller "Deadly Circuit", is directed and adapted by Stephan Elliott. Starring Ewan McGregor and Ashley Judd, the film is an international co-production of Canada, the United Kingdom, and Australia. Stephen Wilson aka "The Eye" (Ewan McGregor) is an intelligence agent whose current assignment is to track down the socialite son of his wealthy boss and find out what trouble he has