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

Mirage (Mell album)

MIRAGE is the second studio album from the I've Sound singer, Mell, released on October 27, 2010. The album contains eight new songs, one old song from an album released on Comic Market away back 2002, and a remix of her famous song Red Fraction which was used as an opening theme for the OVA of the anime series Black Lagoon. Infection was used as an insert song for the seventh episode of the anime series Highschool of the Dead.

This album will contain her three singles Proof/No Vain, Kill and Rideback.

The album will come in a limited CD+DVD edition (GNCV-1023) and a regular CD-only edition (GNCV-1024). The DVD will contain the PV for the titular track "Mirage" and the making for her activity report for the year 2010.

Track listing (CD)

Mirage (Camel album)

Mirage is Camel's second album, released in 1974. It features some of their best-known songs, including "White Rider" and "Lady Fantasy". It is also a showcase for Andrew Latimer's flute, notably on "Supertwister".

There are five tracks on Mirage, two over 9 minutes. Those two are multi-part songs: "Lady Fantasy" and "Nimrodel/The Procession/The White Rider", the latter being about The Lord of the Rings. The album was released on Gama Records/Deram Records.

The album was voted no. 51 in the Top 100 Prog albums of All Time by readers of 'Prog' magazine in 2014.

Track listing

Personnel

Release details

Mirage (race car)

The Mirage Lightweight Racing Car was a brand of race cars built by J.W. Automotive Engineereing (JWAE) at Slough in England, initially to compete in international sports car races in the colours of the Gulf Oil Corporation.

For the 1967 season, JWAE built and raced the M1, a Sports prototype based on the Ford GT40. The M1 used the standard Ford GT40 V8 engine in various capacities up to 5.7 litres. The highlight of the M1's short racing career was without doubt the victory by Jacky Ickx and Dick Thompson in chassis M.1003 in the 1967 Spa-Francorchamps 1000 km. The sole surviving Mirage M1 is on public display at the Blackhawk Museum in Danville, California (still on display late April 2015).

The M2 was built in 1968 for the new 3 Litre Group 6 Prototype class, but the BRM V12 powered cars were rarely raced and met with no success. The revised and roofless M3 of 1969 was powered by the Ford Cosworth DFV V8 but again this model saw little use, JWA having largely concentrated on racing Ford GT40s during these two years.