| 词条 | Compound shutter |
| 释义 | The Compound shutter is a mechanical leaf shutter for photographic cameras introduced in the late 19th century, usually used between lens components. It was produced by Friedrich Deckel AG, Munich (Germany). A typical Compound shutter may have settings for T (Time), B (Bulb), and times from 1 second down to 1/100th or less. Unlike later mechanical shutters such as the Compur which use a clockwork 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 piston in the cylinder to provide the correct exposure. 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 higher speeds, making their accuracy very sensitive to the precise manufacturing of the cam; lower speeds are more reliably accurate. [https://web.archive.org/web/20070222054604/http://www.skgrimes.com/compound/index.htm Compound Shutters for Large Format Photographers] {{photography-stub}} 1 : Photographic shutters |
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