Diaphragm (optics) bright spots, for example night cityscapes. Some cameras, such as the Olympus XA or lenses such as the MC Zenitar-ME1, however, use a two-bladed diaphragm with right-angle blades creating a square aperture. Similarly, out-of-focus points of light (circles of confusion) appear as polygons with the same number of sides as the aperture has blades. If the blurred light is circular, then it can be inferred that the aperture is either round or the image was shot "wide-open" (with the blades recessed into the sides of the lens, allowing the interior edge of the lens barrel to effectively become the iris).
The Devil's Flower The Devil's Flower The Devil's Flower () is a 2010 Russian romantic fantasy film directed by Ekaterina Grokhovskaya. The main heroine of the picture Polina is pursued by strange dreams, in which she is invited to go through a living flower on the doors of an ancient castle. Trying to figure out what that means, Polina turns to her friend, fortune teller Nastya. Having visited together the archive of the local library, they steal an old book there, which contains a description of the story that Polina sees in her dreams. At the same time, some pages of the book