Canon EOS 40D Instruction Manual page 110

Live View ShootingN
Magnifying the Image for Manual Focusing
Magnification: Approx. 10x
AE lock
Magnified area
Magnification
High temperatures, high ISO speeds, or long exposures may cause noise or
irregular colors in the captured image shot with Live View shooting.
During continuous shooting, the exposure set for the first shot will also
be applied to subsequent shots. If you recompose during continuous
shooting, the exposure might not match the latter shots.
If the camera is not operated for a prolonged period, the power will turn
off automatically as set with [5 Auto power off]. (p.42)
While the image is magnified, pressing the <A> button will not renew the exposure setting.
During the 5x or 10x magnified view, the image sharpness may be applied to a
higher degree than what was set. This is to make it easier to focus manually.
110
Move the focusing frame to the
1
position where you want to focus.
Use <9> to move the focusing
frame in full view. If you press <9>
straight down, the focusing frame will
return to the center.
Press the <u> button.
2
The focusing frame will be magnified.
AE lock will be applied to the full-view
exposure, and the shutter speed and
aperture settings will be displayed in orange.
Each time you press the <u> button,
the display format will change as
follows:
Full view
Focus manually.
3
While looking at the Live View image
on the LCD monitor, turn the lens's
focusing ring to focus manually.
Approx. 5x Approx. 10x