Automatic iris
Lens diaphragm which is restricted by a instrument in the camera body joined to the shutter release.
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Iris Override
An override control that allows the iris opening, selected by the automatic exposure control, to be increased or decreased
Iris ...
Iris - Mechanism that allows to control of the amount of light introduced to the lens by creating circular apertures.
IRIS DIAPHRAGM - Also sometimes simply known as "iris," a device inside a lens of thin overlapping metal leaves that move inwards or outwards, creating an aperture of variable size.
Iris
This image, shot at the Descanso Gardens was one of several that were very similar in nature. Rather than discard it, I put it to the test with flame.
Iris
(see diaphragm)
ISO (International Standards Organization)
The modern speed rating for photographic materials used instead of ASA or DIN*.
IRIS - A certain type of inkjet printer that was first used for reproducing artwork onto fine art papers.
Iris - lens control used to vary its aperture
Depth of field - points nearest and farthest from the camera that are exceptionally sharp ...
Iris
Strictly, iris diaphragm. Device consisting of thin overlapping metal leaves pivoting outwards to form a circular opening of variable size to control light transmission through a lens.
ISA
a 16-bit bus for PCs.
Iris Diaphragm
A continuously adjustable lens aperture consisting of interposed metal leaves.
A ...
iris proof
a proof produced by a color matching system made by Scitex Company.
iron blue (Prussian blue, milori, Berlin and Chinese blue
a class of light fast dark blue pigments, essentially ferric ferrocyanide.
Iris. A set of thin overlapping leaves in a camera lens that pivots outward to form a circular opening of variable size to control the amount of light that can pass through a lens. See also diaphragm.
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Iris see Diaphragm
ISO (International Standards Organization)
A European rating of film sensitivity to light.
J ...
Auto-Iris Lens is a lens with a built-in method of automatically controlling the lens aperature for the best video quality under diverse and changing lighting conditions.
[edit] Iris diaphragms versus other types
A Zeiss rotating diaphragm, 1906[1]. One diaphragm with five apertures.
Preset iris.
Diaphragm with two setting rings or one ring that can be moved to two positions. One is click-stopped, but does not affect the iris, the other moves freely and alters the aperture.
Iris: Iris printers are extremely sophisticated Ink Jet Printers that spit out droplets of ink that are as small as red blood cells! ...
had a iris diaphragm shutter and flash sync to 1/500 sec.
Advice
know what you want and need in a camera.
buy the best you can afford.
learn what accessories are available.
Figure 4: Iris Edge
Figure 4 shows an enlargement of the iris. A place along the edge, that has very high contrast, has been chosen. On the petal side of the edge, the tone is almost pure white.
Automatic iris
Lens diaphragm which is controlled by a mechanism in the camera body coupled to the shutter release. The diaphragm closes to any preset value before the shutter opens and returns to the fully open position when the shutter closes.
Diaphragm (iris diaphragm). The mechanism controlling the size of the lens opening and therefore the amount of light that reaches the film.
Similar to the iris in the human eye, the aperture allows a certain amount of light through the lens to the sensor. The amount is determined by the aperture size, or the size of the opening in the iris.
B ...
The plates in the iris diaphragm fold in on each other to shrink the aperture and expand out to make it wider.
Cameras: The Right Light ...
The variable opening produced by the iris-diaphragm through which light passes to the film plane. Measured in f/stops.
Top of Page Aperture Priority ...
Sometimes applied to an iris diaphragm whose blades operate between lens elements. SHUTTER, FOCAL-PLANE-A shutter located near the focal plane and consisting of a curtain with a slot that is pulled across the focal plane to make the exposure.
Controlling the aperture is an advanced technique which allows you to control the width of the lens opening (like the iris of an eye), allowing for more direct control over how much light enters the camera, ...
What it means is how much light a lens lets through, the one specified means the maximum for your lens with its iris or diaphragm completely open, the less light a lens lets through, the higher the number.
If using an Inkjet process, such as, Epson, Iris or Roland, it is probably easier to work with a transparency. Not all scanners have quality lookup tables for scanning negatives, especially scanners under $1000.
To halve the amount of light that makes it into the iris, the aperture has to be halved as well.
The aperture, or the iris, essentially determines how much light is going to be let in. Logically, the more you open it up the more light is let in and the more you close it the less light is let in.
Instead of an iris that opens (larger aperture, more light gets in and less depth of field) and closes (smaller aperture, less light gets in and more depth of field) in increments, they might have only 2 preset aperture settings.
Aperture - Refers to the camera's adjustable opening (also known as a diaphragm or iris) that allows light to reach the camera's sensor (or film). The size of the aperture is measured using an f-number also called the f-stop (F8, f/8, etc).
It is usually placed near the iris within the camera lens. The leaves are arranged in a circular pattern, suitably pivoted near the housing periphery, ...
Between the lens or leaf shutters operate like an iris that fully closes. To make an exposure the shutter blades move apart for a brief moment and then close again. Leaf shutters synchronize with flashlight at all speeds.
Iris
Another name for the lens aperture. Just like the Iris of your eye, the small blades inside a lens shift to alter the aperture of the lens.
ISO
An acronym for the International Standards Organisation.
Bokeh is the result of complex interaction of the degree of defocus, residual aberrations and the shape of the aperture iris. The rounder the aperture is, the better the bokeh is likely to be. The more expensive lenses like the 50/1.2 and 85/1.
By the close of the 1980s, IRIS printers were installed all over the world and spinning off full-color proofs in commercial printing plants and pre-press shops.
Diaphragm is similar to the iris in the human eye, controlling the amount of light that passes through the lens.
Just like other PowerShot's (and many other digital cameras) the S50 is limited by the fact that it uses a single iris mechanism for both aperture and shutter.
It works the same way that the iris of our eye works. If you haven't already experienced this phenomenon in science class then grab a flash light and go to a mirror. First turn out all the lights and wait for a few seconds.
The pupil will become dramatically smaller as the iris closes to let less light into the eye.
This is how the aperture of a camera works. The aperture is an iris in the lens that can be opened or closed to allow more or less light into the camera.
This is an iris that can open and close to allow more or less light in. Aperture is measured in 'f numbers' - written f/x where x is the ratio of the focal length to the aperture width. Low f-numbers mean wide apertures letting in more light.
The aperture acts like the iris of the eye, opening or closing to let in more or less light. As such, it has control over two aspects of the photographs appearance. First, the change in the amount of light entering the lens alters the exposure.
A walk along The Path turned up some showy new flowers; Rosa Rugosa alongside The Path in Lead Mills and Blue Flag Iris (Iris versicolor) in the wetlands of Wyman Woods. It's after the Blue Flag Iris that Flag Pond in Steer Swamp is named.
In most cases, the diaphragm is iris shaped. The larger the hole in the diaphragm, the smaller the f/stop number. For instance, f/1.4 is wide open, whereas f/16 is the smallest hole, or fully stopped down.
It has a coloured iris with a pupil which can dilate or contract in order to let in more or less light, depending on ambient light conditions. When it's dark the pupil opens up to let in as much light as possible.
For example, the dwarf lake iris I photographed in Michigan, (#1) was taken under an overcast sky. This is the best-case scenario for close-up work. You can see the kind of sky I was working under (#2) for this rock design.
This is caused by the reflection of the flash burst on the iris of the eye. Many cameras have a red eye reduction feature that fires a "mini" flash of light to fool the iris into closing a bit before the real flash fires.
Mechanical systems can use a leaf (or iris) shutter or curtain shutter. In digital cameras a third alternative is also possible: the electronic shutter.
The aperture is the opening formed by the blades of the iris or diaphragm in the lens, through which light passes to expose the film. Aperture size is usually given in f-numbers, the larger the number, the smaller the opening.
It is adjustable and can describe it as the iris of the eye. There is a value represents the degree of variability i.e. a ratio of the equivalent focal length of a lens to the diameter of its entrance pupil.
An alternative to the iris diaphragm is a diaphragm that consists of a series of "blades." This more primitive type of diaphragm was more prevalent in older camera models.
It was sometime during the '80s, with electronic imaging evolving, when I heard about a photographer named Jody Dole, who was doing interesting things with imaging software and Iris printers.
To reduce red-eye, the camera has a red-eye reduction mode that fires a short preflash lamp to close the subject's iris a moment before the actual flash fires to take the picture. It doesn't always work.
Aperture, F-stop A camera's aperture works like the iris of your eye, expanding and contracting to adjust the amount of light which passes through. The smaller the aperture, the less light it admits.
The adjustable opening in a camera lens that -like an eye's iris- controls the amount of light that reaches the film or digital sensor. The size of such aperture is called the f-stop, like f/2.8
Nikonians Photo Glossary ...
These circles of confusion / iris images are related to bokeh, as are all aspects of a particular lenses ability to produce blur, but are only one small facet of "bokeh".
The aperture is usually created by an iris diaphragm that is adjustable, enabling the aperture to be made wider or narrower, thereby letting in more or less light. The size of the aperture is expressed as an '-number, like '/8 or '/11.
No true aperture control (iris only. The 2nd aperture setting appears to be implemented with neutral density filter).
Kepler Track Highlights: The hike goes through beech forests to sometimes snow-covered tussock tops with wonderful views in clear weather. Geology buffs will appreciate this trek, especially Mt. Luxmore. Detour to Iris Burn waterfall, ...
 See also: Photograph, Image, Photography, Time, Digital
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