Canon EOS Rebel XTI - Manual (Page 76)

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This feature takes exposure compensation a step further by varying the
exposure automatically with three shots as shown below. You can then
choose the best exposure. This is called AEB (Auto Exposure
Bracketing).
1
Select [AEB].
Under the [m] tab, select [AEB],
then press <0>.
2
Set the AEB amount.
Press the <U> key to set the AEB
amount, then press <0>.
When you press the shutter button
halfway, the <h> icon and AEB
amount will be displayed on the LCD
monitor.
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.
3 Auto Exposure BracketingN
Standard exposure Making it darker
(Decreased exposure)
Making it brighter
(Increased exposure)
AEB amount