Basic operation, Pressing halfway, Power/quick control dial switch shutter button – Canon 40D User Manual
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<2> : The camera is turned off and does
not operate. Position for when you
do not use the camera.
<1> : The camera operates.
: The camera and <5> operate.
(p.34)
The shutter button has two steps. You can press the shutter button
halfway. Then you can further press the shutter button completely.
Pressing halfway
(0)
This activates autofocusing and
automatic exposure that sets the shutter
speed and aperture.
The exposure setting will be displayed
on the LCD panel and in the viewfinder.
In the Creative Zone modes, pressing
the
button will be the same as
pressing the shutter button halfway.
Basic Operation
Power/Quick Control Dial Switch
Shutter Button
Whenever you set the power switch to <1/J> or <2>, the sensor
cleaning will be executed automatically. During the sensor cleaning, the
LCD monitor will display a logo.
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.
You can change the auto power-off time with the menu’s [5 Auto
power off] setting. (p.42)
If you set the power switch to <2> while the image is being recorded
to the CF card, [Recording ...] will be displayed and the power will turn
off after the CF card finishes recording the image.