Canon EOS-1D X Mark III Advanced User's Manual page 75

Shutter Button
The shutter button has two steps. You can press the shutter button halfway. Then you can
further press the shutter button completely.
Pressing halfway
This activates autofocusing and the automatic exposure system that sets the shutter speed
and aperture value.
The exposure value (shutter speed and aperture value) is displayed in the viewfinder and on
the top LCD panel for approx. 6 sec. (metering timer/
Pressing completely
This releases the shutter and takes the picture.
Preventing camera shake
Hand-held camera movement during the moment of exposure is called camera shake. It
can cause blurred pictures. To prevent camera shake, note the following:
• Hold the camera still, as shown in
• Press the shutter button halfway to autofocus, then slowly press the shutter button
completely.
).
Holding the Camera.
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