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
Snow Flower and the Secret Fan (film) Snow Flower and the Secret Fan (film) Snow Flower and the Secret Fan is a 2011 historical drama film based on the novel of the same name written by Lisa See. Directed by Wayne Wang, the film stars Gianna Jun, Li Bingbing, Archie Kao, Vivian Wu, and Hugh Jackman. In nineteenth century China, two girls named Snow Flower (Gianna Jun) and Lily (Li Bing Bing) are forever bonded together as sworn sisters. They are paired as "laotong" by a matchmaker who is also responsible for arranging their marriages. They are isolated by their families and communicate by writing in a