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required exposure duration. When the shutter release is pressed the shutter opens, and air in the cylinder is gradually released, letting the piston move; it closes the shutter when it reaches the end of its travel. The piston travels for a very short distance at the shortest exposure settings, making accuracy very sensitive to the precise manufacturing of the cam; lower speeds are more reliably accurate.
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mechanism, shutter timing is achieved by releasing air from a small cylinder, typically mounted horizontally at the top of the shutter, through a small aperture. A cam turned by the shutter speed dial positions a spring-loaded piston in the cylinder to provide the correct distance of travel for the
35:, of Munich, Germany. A typical Compound shutter may have settings for T (Time, shutter remains open until the shutter release is pressed again), B (Bulb, shutter remains open as long as the release is held down), and exposure times from 1 second down to 1/100th or less.
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introduced in the late 19th century, usually used between lens components. It was produced by
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69:"Up and Down with Compur - The development and photo-historical meaning of leaf shutters"
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Compound shutters were manufactured for 65 years, the last one being made in 1970.
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90:"Compound Shutters for Large Format Photographers"
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