Canon EOS 6D Mark II Instruction Manual page 481

C.Fn II-7
If focus cannot be achieved with autofocus, you can have the camera
keep searching for the precise focus or have it stop searching.
0: Continue focus search
If focus cannot be achieved with autofocus, the lens is driven to
search for the precise focus.
1: Stop focus search
If autofocus starts and the focus is far off or if focus cannot be
achieved, the lens drive will not be performed. This prevents the lens
from becoming grossly out of focus due to the focus search drive.
When focus search drive is performed using a super telephoto lens or a lens
with a wide focusing drive range, the lens can become grossly out of focus,
and it may take more time to achieve focus next time. Setting [1: Stop
focus search] is recommended.
C.Fn II-8
N : Manual select.:Spot AF
E : Manual selection:1 pt AF
F : Manual select.:Zone AF
G : Manual select.:Large Zone AF
H : Auto selection AF
The [X] mark cannot be removed from [Manual selection:1 pt AF].
If the attached lens belongs to group G or H, you cannot use certain AF
area selection modes even if you add a checkmark [X] in [Select AF
area selec. mode].
Lens drive when AF impossible
Select AF area selection mode
You can limit the selectable AF area
selection modes to suit your shooting
preferences. Select the desired AF area
selection mode and press <0> to add a
checkmark [X]. Then select [OK] to
register the setting.
The AF area selection modes are
described on pages 134-135.
3 Custom Function SettingsN
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