Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 129)

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Selecting the AF Area and AF Point (Viewfi nder Shooting)
G : Large Zone AF (Manual
selection of zone)
 The AF area is divided into three
focusing zones (left, center, and right)
for focusing.
 Subjects are easier to acquire than with
Zone AF.
 Generally focuses on the nearest
subject. Note that any detected faces
are given priority in focusing.
 With AI Servo AF, focusing continues as
long as subjects can be tracked within
the large zone.
H : Automatic selection AF

The Area AF frame (entire AF area) is
used to focus.

With One-Shot AF, generally focuses
on the nearest subject. Note that any
detected faces are given priority in
focusing.

With AI Servo AF, you can set the initial
position for AI Servo AF ( = 133). As
long as the Area AF frame can track the
subject during shooting, focusing will
continue.