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 or digital photography, this notion is less meaningful, so the term "shutter button" is more used.
- 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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