Diaphragm (optics) 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 has two to twenty blades (with most lenses today featuring between five and ten 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
Diana Vreeland: The Eye Has to Travel 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 her time at "Harper’s Bazaar" and "Vogue". The film was directed and produced by Lisa Immordino Vreeland (Diana’s granddaughter-in-law), Bent-Jorgen Perlmutt, and Frédéric Tcheng. It premiered at the 2011 Venice International Film Festival and the Telluride Film Festival. It has a total running time of 86 minutes, and can be seen with English, French, and Italian subtitles. The film features recorded audio and filmed interviews of Vreeland, as well