Diaphragm (optics)

In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses). The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through 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.

Iris diaphragms versus other types

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 photographic lens is called an iris diaphragm.

Iris (1987 film)

Iris is a 1987 Netherlands film directed by Mady Saks and starring Monique van de Ven.

Plot

A young woman, Iris, runs away to the big city on her eighteenth birthday. She moves in with an architect and decides to become a veterinarian. With an inheritance she buys an existing clinic in a backwoods town where Iris is leered at by the men, scorned by the women. Cruel jokes and gossip eventually lead to violence.A local thug breaks in her house while she is out. When she returns home late night, he attacks her, drag her to the wooden stairs, ties her hands, stretch her legs wide apart and ties to the railing of stairs and rapes her brutally.

References

External links

Iris (EP)

Iris is Miranda Sex Garden's second release, and first EP.

Track listing

Radiant

Radiant may refer to:

Computers and software

Music

Ships

Others

Radiant (Iris album)

Radiant is the fifth studio album by the electropop band Iris, released on October 24, 2014 through Dependent Records.

Background

In a 2012 interview, Andrew Sega said that while writing "Cruel Silence" from the album Blacklight, he knew it "had a non-zero chance of being the last song on the last ever Iris album." After finishing the U.S. tour for Blacklight, Reagan Jones and Sega parted ways due to a tour argument, and Iris was put on hold. There was more than a year of silence between the band members, and Sega thought that Iris would never again release another album. However, this ended when Jones sent Sega three demo songs, which would form the basis of Radiant. In 2014, Iris signed with Dependent Records.

According to Sega, "[Radiant] is the story of a man who all of a sudden sees his world within a new environment and realises how bright and radiant it can truly be, if one looks upon it with different eyes."

The album was mastered at Timeless Mastering in Brooklyn, New York using entirely analog recording.