Small-Format Cameras, ContinuedShuttersCamera shutters control both the exact instant film is exposed to light and theduration of exposure. The two types of camera shutters are the leaf shutterand the focal-plane shutter.Leaf shuttersLeaf shutters consist of several blades of spring steel that overlap each other.Pressing the shutter release button rapidly moves the blades apart or open toallow light to strike the film. The blades remain open for the duration of thepreset exposure time (shutter speed) before springing shut again. Leafshutters may be used with a flash unit at all shutter speeds.Figure 7-11 illustrates the operation of leaf shutters.Figure 7-11.—Leaf shutter operation.Continued on next page7-18
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