In photography the shutter-release button (sometimes just shutter release or shutter button) is a push-button found on many cameras, used to take a picture. When pressed, the shutter of the camera is "released", so that it opens to capture a picture, and then closes, allowing an exposure time as determined by the shutter speed setting (which may be automatic). Some cameras also utilize an electronic shutter, as opposed to a mechanical shutter.
The term "release" comes from old mechanical shutters that were "cocked" or "tensioned" by one lever, and then "released" by another. In modern-day photography, this notion is less meaningful, so is gradually falling from use.
- David D. Busch (2006). Digital Photography All-in-One Desk Reference for Dummies. For Dummies. p. 260. ISBN 978-0-470-03743-0.
- Peter G. Dorrell (1994). Photography in Archaeology and Conservation. Cambridge University Press. p. 42. ISBN 978-0-521-45554-1.
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