Canon EOS 550D Instruction Manual page 107

Custom Function Settings*
You can assign a frequently-used function to <8>. Press <8> when the
camera is shootingoready.
O: Normal (disabled)
1: linage quality
Press <_> to display the image-recording quality setting screen on the
LCD monitor.
Press the < _;_ > key to select the image-recording quality, then press
<:_>.
2: Flash exposure compensation
When you press <8>, the flash exposure compensation setting screen
will appear.
3: LCD monitor On/Off
Assigns the same function as the <D[SR> button.
4: Menu display
Assigns the same function as the <MENU> buttom
5: ISO speed
Assigns the same function as the <[SO> button.
O: Display on
When the power switch is turned on, the shooting settings wil! be
displayed (p_44).
1: Previous display status
If you pressed the <D[SR> button and turned off the camera while the
LCD monitor was off, the shooting settings will not be displayed when
you turn on the camera again. This helps to save battery power. The
menu screens and image playback will stitl be displayed when used.
If you pressed the <DISR> button and turned off the camera while the
LCD monitor was on, the shooting settings will be displayed when you
turn on the camera again.
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