The shutter release is the button that actually takes the picture. Press the shutter release, a remote shutter release, half-press the shutter release.
Half-pressing it usually sets the focus, and pressing it fully takes the frame. A remote shutter release keeps the hands off the camera, which matters for long exposures.
1nounshutter releaseThe button that actually takes the picture.
“He kept his finger on the shutter release for the whole of the run.”
shutter release is a control.
Practised in Photography & Film