Canon EOS Rebel XTI - Manual (Page 46)

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To photograph a moving subject whether it be a child running or an auto
race, use the <5> (Sports) mode.
Use a telephoto lens.
Using a telephoto lens is recommended so you can shoot from afar.
Use the center AF point to focus.
Aim the center AF point over the subject, then press the shutter
button halfway to auto focus. During autofocusing, the beeper will
continue beeping softly. If focus cannot be achieved, the focus
confirmation light <o> will blink.
When you want to take the picture, press the shutter button
completely. While holding down the shutter button, continuous
shooting (max. approx. 3 shots per sec.) and autofocusing will take
effect.
5 Shooting Moving Subjects
Shooting Tips
Under low light when camera shake is prone to occur, the viewfinder’s
shutter speed display on the lower left will blink. Hold the camera steady
and shoot.