Canon EOS 350D Instruction Manual page 100

Using the Built-in Flash
y Flash Exposure CompensationN
In the same way as normal exposure compensation, you can set
exposure compensation for flash. You can set flash exposure
compensation up to ±2 stops in 1/3-stop increments.
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The flash exposure compensation amount will remain in effect even after
you turn the power switch to <2>.
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The procedure is the same with EX-series Speedlites. The flash
exposure compensation amount can be set with the camera.
100
1 Select [Flash exp comp].
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Select the [m] tab.
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Press the <V> key to select [Flash
exp comp], then press <0>.
2
Set the flash exposure
compensation amount.
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Press the <U> key to set the
desired amount, then press <0>.
Exposure level mark
Decreased
exposure
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To cancel the flash exposure
compensation, set the flash exposure
compensation amount back to <E>.
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When you press the shutter button
halfway, the <y> icon will be
displayed in the viewfinder and on the
LCD panel.
3 Take the picture.
Standard exposure index
Increased
exposure