Canon Xsi Instruction Manual page 79

y Flash Exposure CompensationN
Set flash exposure compensation if the flash exposure of the subject does not
come out as desired. This feature also works with external EX-series Speedlites.
A bright flash exposure
If the [7 Custom Functions (C.Fn)] menu's [Auto Lighting Optimizer]
(p.156) is set to [0: Enable], the exposure compensation and flash exposure
compensation may not be effective. In such cases, set it to [1: Disable].
Select [Flash exp comp].
1
Under the [2] tab, select [Flash exp
comp], then press <0>.
Set the exposure compensation
2
amount.
To make the flash exposure brighter,
press the <Z> key. Or to make it
darker, press the <Y> key.
After setting the flash exposure
compensation amount, press <0>.
When you press the shutter button
halfway, the <y> icon and flash
exposure compensation amount will be
displayed on the LCD monitor and the
<y> icon will appear in the viewfinder.
After taking the picture, do step 2 to
reset the flash exposure
compensation amount to zero.
Flash exposure compensation
Setting Exposure CompensationN
making it darker
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