Canon EOS 30D - Manual (Page 93)

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Exposure compensation is used to alter the standard exposure setting set by the camera.
You can make the image look lighter (increased exposure) or darker (decreased
exposure). You can set the exposure compensation up to ±2 stops in 1/3-stop increments.
1
Turn the Mode Dial to any
Creative Zone mode except <a>.
2
Check the exposure level indicator.
Press the shutter button halfway and
check the exposure level indicator.
3
Set the exposure compensation amount.
Set the <4> switch to <J>, and
while looking at the viewfinder or LCD
panel, turn the <5> dial.
Turn the <5> dial either while pressing
the shutter button halfway or within (0)
after pressing the shutter button halfway.
To cancel the exposure compensation, set the
exposure compensation amount back to <E>.
4
Take the picture.
Setting Exposure CompensationN
Increased exposure
Decreased exposure
Standard exposure index
Exposure level
mark
Decreased exposure
Increased
exposure
The exposure compensation amount will remain in effect even after the
<4> switch is set to <2>.
If the standard exposure setting is 1/125 sec. and f/8.0, setting the
exposure compensation amount to plus or minus one stop will be the
same as setting the shutter speed or aperture as follows:
Take care not to turn the <5> dial and change the exposure compensation
inadvertently. To prevent this, turn the <4> switch to <1>.
-1 stop ← 0 → +1 stop
Shutter speed 250 ← 125 → 60
Aperture 11 ← 8.0 → 5.6