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
A Flower in a Sinful Sea addition the word sounds similar to "hua" (T: 華, S: 华, P: "huá", W: "hua"), meaning China. The title has also been translated as "Flower in a Sea of Sin", "Flower in the Sea of Retribution", "Flower in the World of Retribution", "Flower in a Sea of Karma", "Flower in the Sea of Evil" or "A Flower in an Ocean of Sin". In the earlier versions of the novel by Jin Tianhe, Sai Jinhua, a courtesan, travels to the west with her husband, a scholar. They meet Russian anarchists and the novel describes the history of the Russian anarchist movement.