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In photography the shutter-release button (sometimes just shutter release or shutter button) is a 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).

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How long is too long to leave the shutter open before prolonged exposure to light damages th...

As long as you aren't pointing the camera at the sun, lasers etc. (see this question) You should be ok, at worst you'll get a completely over exposed image and the camera may give an over heating wa …
Richard Smith's user avatar