Canon EOS 7D - Manual (Page 91)

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As default setting, the following three AF area selection modes can be
selected. See the next page for the selection procedure.
Single-point AF (Manual selection) (p.93)
Select one AF point to focus.
Zone AF (Manual selection of a zone) (p.94)
The 19 AF points are divided into five zones for
focusing.
Auto select 19-point AF (p.94)
All the AF points are used to focus. Set in fully-
automatic modes (1/C).
With [8C.Fn III -6: Select AF area selec. mode] (p.228), the following
two AF area selection modes can be added.
Spot AF (Manual selection) (p.93)
For pinpoint focusing.
AF point expansion (Manual selection) (p.93)
The manually-selected AF point <S> and adjacent
AF points <w> are used to focus.
S Selecting the AF AreaN
Default AF Area Selection Modes
AF Area Selection Modes Added with Custom Functions