Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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If you turn on the power switch and the date/time/zone setting 
screen appears, see page 51 to
 set the date/time/zone.
<1> : The camera turns on.
<2>: The camera is turned off and 
does not function. Set the 
power switch to this position 
when not using the camera.
 
Whenever you set the power switch 
to <1> or <2>, sensor 
cleaning will be performed 
automatically. (A small sound may be 
heard.) During the sensor cleaning, 
the LCD monitor will display <f>.
 
You can still shoot during sensor cleaning by pressing the shutter 
button halfway (p.58) to stop cleaning and take a picture.
 
If you repeatedly turn the power switch <1>/<2> at a short 
interval, the <f> icon may not be displayed. This is normal and 
not a malfunction.
 
To save battery power, the camera turns off automatically after 
approx. 1 minute of non-operation. To turn on the camera again, just 
press the shutter button halfway (p.58).
 
You can change the auto power off time with [52: Auto power off
(p.76).
Turning on the Power
Automatic Sensor Cleaning
Auto Power Off
If you set the power switch to <2> while an image is being recorded to 
the card, [Recording...] will be displayed and the power will turn off after the 
recording finishes.