Canon EOS Rebel T2i/550D Setting Up page 6

Rear camera controls
The controls on the back of the Rebel T2i/550D enable you to make quick adjustments
while you're shooting. Some of the rear camera controls can be used only in P, Tv, Av,
M, and A-DEP shooting modes. In automatic camera modes such as Portrait,
Landscape, and Sports, the camera sets all of the settings for you, so pressing the AV,
WB, and Drive mode selection buttons has no effect. But in P, Tv, Av, or M, and
A-DEP shooting modes, these buttons function as described in the following list.
If you're shooting and press a button and nothing happens, check the Mode
dial to see if you're using an automatic mode such as Portrait or Landscape. If
TIP
you want to change the white balance, then turn the Mode dial to P, Tv, Av, M, or
A-DEP shooting mode.
Here is a look at the back of the camera.
Menu button. Press the Menu button to display camera menus on the LCD. To
move among menu tabs, turn the Main dial or press the left or right cross keys on
the back of the camera. (The cross keys are the keys surrounding the Set button.)
Display button. Press this button to turn the LCD display and the current cam-
era settings off and on. If you are playing back images, pressing this button one
or more times changes the display to show more or less shooting information
and to display one or more histograms displayed next to the image preview.
Display off sensor. This sensor detects when you move the camera to your eye
and automatically turns off the LCD display.
Dioptric adjustment knob. Turn this knob to adjust the sharpness for your
vision by -3 to +1 diopters. If you wear eyeglasses or contact lenses for shoot-
ing, be sure to wear them as you adjust the Dioptric adjustment knob. To make
the adjustment, point the lens to a light-colored surface such as a white wall,
and then turn the control until the AF points in the viewfi nder are perfectly sharp
for your vision.
Viewfi nder. Look through the viewfi nder to view and compose the scene. On
the Rebel T2i/550D, the viewfi nder offers an approximately 95 percent view of
the scene. The viewfi nder uses a Precision Matte focusing screen that displays
then nine autofocus (AF) points.
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Canon EOS Rebel T2i/550D Digital Field Guide