Diaphragm (optics) the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system. Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris. See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm. A natural optical system that has a diaphragm and an aperture is the human eye. The iris is the diaphragm, and the opening in the iris of the eye (the pupil) is the aperture. An analogous dev in a
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