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) the Bund. Rupert Murdoch personally arranged for the film to be released by Fox Searchlight Pictures, which opened the film in North America on July 15, 2011.<ref name="http://www.movingpicturesnetwork.com/27627/summer-preview-2011-snow-flower-secret-fan/"></ref> The film received generally negative reviews from critics. On Rotten Tomatoes, it has a 21% approval rating, based on 87 reviews. On Metacritic, it has a score of 42 out of a possible 100, based on 31 reviews. 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