Canon eos rebel T2i - Manual (Page 83)

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You can set both the shutter speed and aperture manually as desired.
With flash, the flash exposure will be set automatically to match the
aperture that was set. The flash sync speed can be set within 1/200
sec. to 1/30 sec. or to bulb.
* <a> stands for Manual.
1
Set the Mode Dial to <a>.
2
Set the shutter speed and
aperture.
To set the shutter speed, turn the
<6> dial.
To set the aperture, hold down the
<O> button and turn the <6>
dial.
3
Set the exposure and take the
picture.
The exposure level indicator in the
viewfinder indicates the exposure
level up to ±2 stops from the standard
exposure index at the center. While
you change the shutter speed and
aperture, the exposure level mark will
move. You can decide which
exposure level to set. If the amount
set exceeds ±2 stops, the end of the
exposure level indicator will display
<I> or <J>.
a : Manual Exposure
<6>
<O> + <6>
Exposure level mark
Standard exposure index
If the [2 Auto Lighting Optimizer] (p.103) is set to anything other than
[Disable], the image may still look bright even if a darker exposure has been
set.
COP
Y