Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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61 AF points are provided for AF. You can select the AF point(s) suiting 
the scene or subject.
Depending on the lens attached to the camera, the number of 
usable AF points and AF point patterns will differ. For details, 
see “Lenses and Usable AF Points” on page 79.
You can select one of six AF area selection modes. See the next page 
for the selection procedure.
Single-point Spot AF (Manual 
selection)
For pinpoint focusing.
Single-point AF (Manual 
selection)
Select one AF point to focus.
AF point expansion (Manual 
selection )
The manually-selected AF point <S> 
and four surrounding AF points <w> 
(above, below, on the left and on the 
right) are used to focus.
S
 Selecting the AF AreaN
AF Area Selection Mode