Shutter (photography)

In photography, a shutter is a device that administers the exposure by admitting light to the film for a specific period of time. Shutters are normally of two basic types:

Related Topics:
Photography - Exposure - Light - Film

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• Central shutter
• Focal plane shutter

A timing mechanism is required to support the different shutter speeds. These were originally pure mechanical devices, but are now mostly replaced by electronic timers.

Related Topics:
Timing mechanism - Electronic

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Cinematography uses a rotary disc shutter in movie cameras, a continuously spinning disc which conceals the image with a reflex mirror during the intermittent motion between frame exposure. The disc then spins to an open section that exposes the next frame of film while it is held by the registration pin.

Related Topics:
Cinematography - Rotary disc shutter - Movie cameras - Registration pin

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In movie projection, the shutter admits light from the lamphouse to illuminate the film across to the projection screen. To avoid flicker, a double-bladed rotary disc shutter admits light 2 times each frame of film. There are also some models which are triple bladed, and thus do this and 3 times per frame (see Persistence of vision).

Related Topics:
Movie projection - Rotary disc shutter - Persistence of vision

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Shutter (photography): See also ►