Canon EOS 7D Instruction Manual page 212

3 Custom Function SettingsN
It is best to make the adjustment at the actual place where you will shoot.
This will make the adjustment more precise.
With setting 2, if an Extender is used, the adjustment will be registered
for the lens and Extender combination.
The registered AF microadjustments will be retained even if you use the
Custom Function to clear all settings (p.204). However, the setting itself
will be [0: Disable].
AF adjustment cannot be done during Live View shooting in Live and u
Live modes.
C.Fn III -6 Select AF area selection mode
If you select [Disable] and press <0>, the default setting will make 19
point AF, Zone AF (Manual select), and Single point AF selectable.
C.Fn III -7
During manual AF point selection, the selection can either stop at the outer
edge or it can go on to the opposite AF point. This is effective for all the AF
area selection modes except for 19 point AF auto selection and Zone AF.
0: Stops at AF area edges
Convenient if you often use an AF point along the edge.
1: Continuous
Instead of stopping at the edge, the AF point selection continues to the
opposite edge.
212
Make the mode selectable by selecting
[Register], then pressing <0>.
Turn the <5> dial to select the mode to be
used, then press <0> to append a <X>
checkmark.
After making the selection, turn the <5> dial
to select [Apply], then press <0>.
If you select [Enable] and press <0>, only
the modes with the <X> checkmark will be
selectable.
Manual AF point selection pattern