Canon 40D - Manual (Page 94)

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By changing the shutter speed or aperture automatically, the camera
brackets the exposure up to ±2 stops in 1/3-stop increments for three
successive shots. This is called AEB.
* AEB stands for Auto Exposure Bracketing.
1
Select [AEB].
Under the [2] tab, select [AEB], then
press <0>.
2
Set the AEB amount.
Turn the <5> dial to set the AEB
amount, then press <0>.
X When you exit the menu, <h> and
the AEB level will be displayed on the
LCD panel.
3
Take the picture.
Focus and press the shutter button
completely. The three bracketed shots
will be taken in this sequence: Standard,
decreased, and increased exposure.
Follow steps 1 and 2 to set the AEB amount to < >.
AEB will be canceled automatically when you set the power switch
to <2> or the flash is ready to fire.
3 Auto Exposure Bracketing (AEB)N
AEB amount
Canceling AEB
If the drive mode is set to <u>, you must press the shutter button three
times. When <o> or <i> is set and you hold down the shutter button
completely, the three bracketed shots will be taken continuously. Then
the camera will stop shooting. When <j> or <l> is set, the three
bracketed shots will be taken after a 10-sec. or 2-sec. delay.
AEB can be combined with exposure compensation.
Neither flash nor bulb exposures can be used with AEB.