Canon EOS Rebel XTI - Manual (Page 31)

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The camera can operate only after the power switch is turned on.
<1> : The power lamp lights, and the
camera turns on.
<2>: The camera is off and does not
operate. Set to this position
when not using the camera.
By adjusting the viewfinder to suit your eyesight, you can see a sharp
viewfinder image even without eyeglasses.
Turn the dioptric adjustment
knob.
Turn the knob left or right so that the
nine AF points in the viewfinder look
sharp.
How to Shoot
Power Switch
Adjusting the Viewfinder Image
When the power switch is turned on or off, the < > icon is displayed
on the LCD monitor to indicate that self-cleaning sensor system is
operating.
To save battery power, the camera turns off automatically after about 30
seconds 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 [c Auto
power off] setting. (p.95)
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.
If the camera’s dioptric adjustment still cannot provide a sharp viewfinder
image, using Dioptric Adjustment Lens E (10 types, optional) is
recommended.