Datasheet

✦ Main dial. This dial selects a vari-
ety of settings and options. Turn
the Main dial to manually select an
AF (autofocus) point after pressing
the AF-point selection/Magnify but-
ton, and to set the aperture in Av
mode, the shutter speed in Tv and
Manual modes, and to shift the
exposure program in P mode.
Additionally, you can use the Main
dial to scroll among Menu tabs.
✦ Shutter button. Pressing the
Shutter button halfway sets the
point of sharpest focus at the
selected AF point in manual AF-
point selection mode, and it simul-
taneously sets the exposure based
on the ISO and selected shooting
mode. Pressing the Shutter com-
pletely makes the exposure. In any
mode except Direct Printing, you
can also half-press the Shutter but-
ton and dismiss camera menus
and image playback.
6 Part I ✦ Using the Rebel XSi/450D
Shutter button
Main dial
ISO speed button
Power switch
Mode dial
1.2 Rebel XSi/450D top camera controls
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