Diaphragm (optics) photographic lens is called an iris diaphragm. In the early years of photography, a lens could be fitted with one of a set of interchangeable diaphragms , often as brass strips known as Waterhouse stops or Waterhouse diaphragms. The iris diaphragm in most modern still and video cameras is adjusted by movable blades, simulating the iris of the eye. The diaphragm has two to twenty blades (with most lenses today featuring between five and ten blades), depending on price and quality of the device in which it is used. Straight blades result in polygon shape of the diaphragm opening, while
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