Shutter Button; Pressing Halfway - Canon EOS-1D Mark II Digial Instruction Manual

Shutter Button

The shutter button has two stages. You can press the shutter button
halfway. Then you can further press the shutter button completely.
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If you press the shutter button halfway and (
halfway again and wait a moment before pressing it completely to take a
picture. If you press the shutter button completely without pressing it
halfway first or if you press the shutter button halfway and then press it
completely immediately, the camera will take a moment before it takes
the picture.
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No matter what state the camera is in (image playback, menu operation,
image recording, etc.), you can return to shooting instantly just by
pressing the shutter button halfway.
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Pressing halfway

This activates autofocusing (AF) and
automatic exposure (AE) that sets the
shutter speed and aperture.
The exposure setting (shutter speed and
aperture) is displayed on the top LCD
panel and in the viewfinder.
Pressing completely
This releases the shutter and takes the
picture.
9
9
( )
) elapse, you must press it