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The Shutter Button and Autofocusing
The EOS camera's shutter button can be pressed halfway or all the way. It
operates as described below (with the lens' focus mode switch set to AF).
When it is pressed halfway:
*You can set your camera to focus the
image automatically when you press the
shutter button halfway (this is called
autofocusing, or AF). When the camera
has focused on your subject, it beeps
twice, and the green "in-focus" mark
appears in the lower right part of the
viewfinder frame. The AF frame also
appears in the viewfinder to show the
frame in which the camera has focused.
*At the same time, the camera determines
the exposure setting (a combination of
the shutter speed and aperture setting),
and displays it in the LCD panel.
When it is pressed the rest of the
way:
+The shutter is released to expose one
picture, and the film is advanced one
frame.
Camera movement during the moment of exposure can cause blurred
pictures.
To prevent this:
+ Hold the camera steady.
+ Put the center of your fingertip over the shutter button and grip the camera
with your entire right hand. Then press the shutter button gently.
* Use a faster shutter speed.
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