Canon EOS 5D - Manual (Page 30)

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The camera can operate only after the <4> switch is turned on.
<2>: The camera is turned off and
does not operate.
<1> : The camera operates.
<J> : The camera and <5> operate.
(p.32)
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 (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. (0)
Pressing completely
This releases the shutter and takes the
picture.
Basic Operation
Power Switch
Shutter Button
To save battery power, the camera turns off automatically after 1 minute of non-
operation. To turn on the camera again, press the shutter button or other button.
You can change the auto power-off time with the menu’s [c Auto
power off] setting. (p.39)
If you turn the <4> switch to <2> while the captured images are being recorded
onto the CF card, the remaining number of captured images to be recorded will be
indicated on the top LCD panel with the number of <N>. When all the images are
finished recording, the display will turn off and the camera will turn off.