Diaphragm (optics) 1889 "Dictionary of Photography" (see figure), but disappeared after Ernst Abbe's theory of stops unified these concepts. According to Rudolf Kingslake, the inventor of the iris diaphragm is unknown. Others credit Joseph Nicéphore Niépce for this device, around 1820. Mr. J. H. Brown, a member of the Royal Microscopical Society, appears to have invented a popular improved iris diaphragm by 1867. Kingslake has more definite histories for some other diaphragm types, such as M. Noton's adjustable "cat eye" diaphragm of two sliding squares in 1856, and the Waterhouse stops of John Waterhouse in 1858. Diaphragm (optics) In optics, a diaphragm
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