Canon EOS 7D - Manual (Page 27)

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<1> : The camera turns on.
<2> : The camera is turned off and
does not operate. Set to this
position when not using the
camera.
Whenever you set the power switch to <1> or <2>, the sensor
cleaning will be executed automatically. During the sensor cleaning,
the LCD monitor will display <f>. Even during the sensor
cleaning, you can still shoot by pressing the shutter button halfway
(p.35) to stop the sensor cleaning and take a picture.
If you repeatedly turn the power switch <1>/<2> at a short
interval, the <f> icon might not be displayed. This is normal and
not a problem.
To save battery power, the camera turns off automatically after about
1 minute of non-operation. To turn on the camera again, just press
the shutter button halfway (p.35).
You can change the auto power-off time with the menu’s [5 Auto
power off] setting (p.46).
Turning on the Power
About the Automatic Self-Cleaning Sensor
About 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 card finishes recording the image.