Canon EOS 3 User Manual (en)

2. Area AF Ellipse and Focusing Points
The area AF ellipse is an area where the subject is focused. The area AF
ellipse has 45 focusing points, making AF possible over a wide area in the
viewfinder. You can concentrate on composing the picture without
worrying about whether a focusing point is covering the subject. As long
as the subject is within the area AF ellipse, the camera will focus the
subject automatically.
Focusing points in the area AF ellipse 
(The focusing points do not light up all at once.)
Focusing point
Area AF ellipse
 04. C836-E (33~)  28-01-2003  11:10  Pagina 37