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Encyclopedia > Leaf shutter

In photography, a leaf shutter is a type of camera shutter consisting of a pivoting metal leaf and spring which briefly uncovers the camera aperture to make the exposure.

Simple leaf shutters typically have only one shutter speed and are commonly found in disposable cameras and cheap point-and-shoot cameras. In its more complex forms it can have variable shutter speeds.

central leaf shutter

Simple leaf shutter

1. Shutter plate
2. Aperture covered by leaf shutter.
3. Aperture during exposure.
4. Leaf blade
5. Catch mechanism
6. Butterfly spring

The main advantages of the leaf shutter are:

  • Relatively simple construction is possible.
  • No cocking mechanism
  • No variable shutter speeds
  • Less costly than a focal plane 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.
  • Many versions have no connection between the release mechanism and the film advance, making multiple exposures possible.

Some of the disadvantages of the leaf shutter are:

  • Shutter speeds are limited to 1/500th or 1/250th of a second.
  • Although also listed as an advantage, accidental multiple exposures are common problem.
  • Imprecise speeds (e.g. Holga camera)

  Results from FactBites:
Central shutter - Wikipedia, the free encyclopedia (369 words)
Film-based cameras with a central shutter and interchangeable lenses often have a secondary shutter or darkslide that can be operated to prevent film exposure from occurring while the lens is removed.
The most basic type of central shutter is the metal leaf shutter, but the diaphragm shutter is used on many professional systems where the central shutter is located within the lens body.
Shutter speeds are limited to how fast the shutter can be made to move; normally 1/500th of a second for a diaphragm shutter and 1/125th of a second for a leaf shutter.
Leaf shutter - Camerapedia.org (288 words)
A leaf shutter is a shutter made of a series of overlapping metal blades arranged in a circular pattern, usually positioned near the iris within a lens.
Leaf shutters are typically not capable of shutter speeds as high as modern focal plane shutters; usually the highest speed possible with a leaf shutter is 1/500th of a second.
To make interchangeable lens systems, you must either integrate the leaf shutter into the lens, which makes it more expensive (for example, the Hasselblad 500), or place the shutter in the camera body behind the lens, which limits the range of focal lengths and the maximum aperture (for example, the Paxette).
  More results at FactBites »



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