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
Diana Vreeland: The Eye Has to Travel stylish doc should enjoy a nice arthouse run before becoming an essential presence on the DVD shelves of fashionistas everywhere.” Writing for "Variety", Jay Weissberg says, “Few names conjure ‘style’ with the zest of Diana Vreeland, and documentary "The Eye Has to Travel" gets the zing just right.” Currently, the film has a rating of 95% on Rotten Tomatoes, based on 63 reviews and an average score of 7.2/10. Diana Vreeland: The Eye Has to Travel Diana Vreeland: The Eye Has to Travel is a 2011 documentary about the life and career of Diana Vreeland, a fashion legacy famous for