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 Stone Flower (1946 film) The Stone Flower (1946 film) The Stone Flower () is a 1946 Soviet fantasy film directed by Aleksandr Ptushko. It is an adaptation of Pavel Bazhov's story of the same name, in turn based on Ural region Russian folklore. It also incorporates plot elements from the stories "The Mistress of the Copper Mountain" and "The Master Craftsman". "The Stone Flower" was theatrically released by Mosfilm on 28 April 1946. It was the Soviet Union's first color film shot on Agfacolor negative film seized in Germany, and was entered into the 1946 Cannes Film Festival. It was a success at the