Canon EOS Rebel XTI - Manual (Page 33)

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How to Shoot
The shutter button has two steps. You can press the shutter button
halfway. Then you can further press the shutter button completely.
Pressing halfway
This activates autofocusing (AF) and
automatic exposure (AE) that sets the
shutter speed and aperture.
The exposure setting (shutter speed and
aperture) is displayed in the viewfinder.
(0)
Pressing completely
This releases the shutter and takes the
picture.
Preventing Camera Shake
Camera movement during the moment of exposure is called camera
shake. Camera shake can cause blurred pictures. To prevent camera
shake, note the following:
· Hold and steady the camera as shown on the previous page.
· Press the shutter button halfway to autofocus, then press the
shutter button completely.
Shutter Button
If you press the shutter button completely without pressing it halfway first
or if you press the shutter button halfway and then press it completely
immediately, the camera will take a moment before it takes the picture.
No matter what state the camera is in (image playback, menu operation,
image recording, etc.), you can return to shooting instantly just by
pressing the shutter button halfway (except during direct printing and
while the direct image transfer screen is displayed).