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(Redirected from Diaphragm shutter)
In photography, a 'leaf shutter' is a type of camera shutter consisting of a mechanism with one or more pivoting metal leaves which normally does not allow light through the lens onto the film, but which when triggered opens the shutter by moving the leaves to uncover the lens for the required time to make an exposure, then shuts.
Simple leaf shutters have a single leaf, or two leaves, which pivot so as to allow light through to the lens when triggered. If two leaves are used they have curved edges to create a roughly circular aperture. Simple leaf shutters typically have only one shutter speed and are commonly found in disposable cameras and cheap point-and-shoot cameras. Some have more than one speed.
The main advantages of the leaf shutter are:
★ Relatively simple construction is possible.
★ No cocking mechanism
★ Simple to use as the shutter speed is fixed
★ Less costly than a focal plane shutter or diaphragm shutter
★ Flash synchronization possible at all speeds.
★ Small size is achieved by placing the shutter at the focal convergent point either inside the lens or inside the camera body.
Some of the disadvantages of the leaf shutter are:
★ Shutter speeds are limited to 1/500th or 1/250th of a second.
★ In practice speeds of these inexpensive shutters may be inaccurate
A diaphragm shutter is a type of leaf shutter consisting of a number of thin blades which briefly uncover the camera aperture to make the exposure. The blades slide over each other in a way which creates a circular aperture which enlarges as quickly as possible to uncover the whole lens, stays open for the required time, then closes in the same way[1]. The larger the number of blades, the more accurately circular is the aperture. An odd number of blades is usually used: 3, 5, or more.
The term ''diaphragm shutter'' has also been used to describe an optical stop with a slit, near the focal plane of a moving-film high-speed camera[2].
1. Sidney Ray, ''Scientific Photography and Applied Imaging'', Oxford: Focal Press, 1999
2. ''Focal Encyclopedia of Photography'', Macmillan, 1957
In photography, a 'leaf shutter' is a type of camera shutter consisting of a mechanism with one or more pivoting metal leaves which normally does not allow light through the lens onto the film, but which when triggered opens the shutter by moving the leaves to uncover the lens for the required time to make an exposure, then shuts.
| Contents |
| Simple leaf shutter |
| Diaphragm shutter |
| References |
Simple leaf shutter
Simple leaf shutters have a single leaf, or two leaves, which pivot so as to allow light through to the lens when triggered. If two leaves are used they have curved edges to create a roughly circular aperture. Simple leaf shutters typically have only one shutter speed and are commonly found in disposable cameras and cheap point-and-shoot cameras. Some have more than one speed.
The main advantages of the leaf shutter are:
★ Relatively simple construction is possible.
★ No cocking mechanism
★ Simple to use as the shutter speed is fixed
★ Less costly than a focal plane shutter or diaphragm shutter
★ Flash synchronization possible at all speeds.
★ Small size is achieved by placing the shutter at the focal convergent point either inside the lens or inside the camera body.
Some of the disadvantages of the leaf shutter are:
★ Shutter speeds are limited to 1/500th or 1/250th of a second.
★ In practice speeds of these inexpensive shutters may be inaccurate
Diaphragm shutter
One diaphragm shutter opening over another in an Akarex camera
Entries in ''Cassell's Cyclopedia of Photography'', 1911. The terminology ''diaphragm shutter'' has since fallen from common use.
A diaphragm shutter is a type of leaf shutter consisting of a number of thin blades which briefly uncover the camera aperture to make the exposure. The blades slide over each other in a way which creates a circular aperture which enlarges as quickly as possible to uncover the whole lens, stays open for the required time, then closes in the same way[1]. The larger the number of blades, the more accurately circular is the aperture. An odd number of blades is usually used: 3, 5, or more.
The term ''diaphragm shutter'' has also been used to describe an optical stop with a slit, near the focal plane of a moving-film high-speed camera[2].
References
1. Sidney Ray, ''Scientific Photography and Applied Imaging'', Oxford: Focal Press, 1999
2. ''Focal Encyclopedia of Photography'', Macmillan, 1957
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