Canon EOS 80D - Manual (Page 116)

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The camera has 45 AF points for autofocusing. You can select the AF
area selection mode and AF point(s) suiting the scene or subject.
You can select one of four AF area selection modes. See the next page
for the selection procedure.
E : Single-point AF
(Manual selection)
Select one AF point to focus.
F : Zone AF
(Manual selection of zone)
The AF area is divided into nine focusing
zones for focusing.
G : Large Zone AF
(Manual selection of zone)
The AF area is divided into three
focusing zones (left, center, and right) for
focusing.
H : 45-point automatic selection
AF
The Area AF frame (entire AF area) is
used to focus.
S
Selecting the AF Area and AF PointN
AF Area Selection Mode
Depending on the lens attached to the camera, the number of usable
AF points, AF point patterns, the shape of Area AF frame, etc. will
differ. For details, see “Lenses and Usable AF Points” on page 119.