Diaphragm shutter
Between the lens camera shutter that performs the function of the iris diaphragm.
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had a iris diaphragm shutter and flash sync to 1/500 sec.
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It restricts the amount of light allowed into the camera. This term can also be applied to shutter types, i.e. iris diaphragm shutter, which is a set of interposing leaves, ...
Therefore the shutter speed is the length of time that the shutter opens to allow the light to come in CCD. The most common shutter types are between-the-lens diaphragm shutter and the focal plane shutter.
It is sometimes called a between-the-lens shutter; however, a more correct term for this type of shutter is a leaf or diaphragm shutter. Leaf shutters have several blades made of thin spring steel.
 See also: Lens, Camera, Diaphragm, Shutter, Light
  
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