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β | The [[camera#Shutter|shutter of a camera or of the lens/shutter unit for a camera]] isolates the film in the camera from light until the shutter will be released. Depending on the shutter type releasing the shutter means to open it for a moment like a diaphragm, like a roller blind, or simply like a sliding door. A wind-up |
+ | The [[camera#Shutter|shutter of a camera or of the lens/shutter unit for a camera]] isolates the film in the camera from light until the shutter will be released. Depending on the shutter type releasing the shutter means to open it for a moment like a diaphragm, like a roller blind, or simply like a sliding door. A wind-up-mechanism or a litte electric servo delivers the shutter movement energy and controls the time of film enlightening. |
==Shutter Types== |
==Shutter Types== |
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===Rotary shutter=== |
===Rotary shutter=== |
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β | Cheap [[box camera]]s are often equipped with a simple '''rotary shutter'''. It consists of a release lever, a spring, a round tin slice with a |
+ | Cheap [[box camera]]s are often equipped with a simple '''rotary shutter'''. It consists of a release lever, a spring, a round tin slice with a whole and a rotation lock lever. When the release lever is used the spring causes the slice rotating once so that the hole in it passes the camera aperture. In this moment the light enters for an instant, except when the rotation locking lever was used before. Then the hole stays in front of the aperture hole until the shutter release lever is let loose. |
==Shutter drive and control systems== |
==Shutter drive and control systems== |
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β | From the control aspect, there are these different kinds of shutter systems in classical cameras. Things here are somewhat simplified for brevity. Ignored here are |
+ | From the control aspect, there are these different kinds of shutter systems in classical cameras. Things here are somewhat simplified for brevity. Ignored here are diaphram type leaf shutters found on fixed lens rangefinder cameras, and you can substitute focal plane leaf shutter for curtain shutter: |
===Purely mechanical=== |
===Purely mechanical=== |