Canon EOS 80D - Manual (Page 283)

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Focusing with AF (AF Method)
AF Operation
 Even when focus is achieved, pressing the shutter button halfway
will focus again.
 The image brightness may change during and after the AF
operation.
 Depending on the subject or shooting conditions, etc., focusing may
take longer or the continuous shooting speed may become slower.
 If the light source changes while the Live View image is displayed,
the screen may flicker and focusing may be difficult. If this happens,
exit Live View shooting and perform AF under the actual light source
under which you are shooting.
 If [u+Tracking] is set, magnified view is not possible.
 When [FlexiZone - Multi] is set and you press the <u> button (or
tap <1> on the screen), the center of the selected zone (or image
center with automatic selection) will be magnified. If you press the
shutter button halfway, the display will return to normal and the
camera will focus.
 When [FlexiZone - Single] is set and you press the <u> button (or
tap <1> on the screen), the area covered by the AF point will be
magnified. Press the shutter button halfway to focus in the magnified
view. This is effective when the camera is attached to a tripod and
you need to attain very precise focus. If focusing is difficult in
magnified view, return to the normal display and use AF. Note that
the AF speed differs between the normal and magnified views.
 If you magnify the view after focusing with [FlexiZone - Multi] or
[FlexiZone - Single] in the normal view, precise focus may not be
achieved.
 In Servo AF mode, when you press the shutter button halfway in the
magnified view, the display will return to normal and the camera will
focus.
Notes for AF
Magnified View