Canon EOS Rebel T2i/550D Setting Up page 5

Chapter 1 Setting Up the EOS Rebel T2i/550D
ISO speed button
Main dial
Shutter button
Focal plane mark Hot shoe Mode dial Power switch
1.2 Rebel T2i/550D top camera controls
Custom Functions are detailed in Chapter 4.
CROSS REF
Main dial. Turning this dial selects a variety of settings and options. Turn the
Main dial to manually select an AF (autofocus) point after pressing the AF-point
Selection/Enlarge button; and to set the aperture (f-stop) in Av mode, the shutter
speed in Tv and Manual mode, and to shift the exposure program in P mode.
Additionally, you can use the Main dial to scroll among the camera menus.
Shutter button. Pressing the Shutter button halfway sets the focus at the
active AF point. Simultaneously the camera determines the aperture (f-stop) and/
or shutter speed based on the current ISO setting. Pressing the Shutter button
completely makes the picture. In any mode except Direct Printing, you can also
half-press the Shutter button to dismiss the camera menus and image playback.
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