Diaphragm (optics) curved blades improve the roundness of the iris opening. In a photograph, the number of blades that the iris diaphragm has can be guessed by counting the number of diffraction spikes converging from a light source or bright reflection. For an odd number of blades, there are twice as many spikes as there are blades. In case of an even number of blades, the two spikes per blade will overlap each other, so the number of spikes visible will be the number of blades in the diaphragm used. This is most apparent in pictures taken in the dark with small
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.