Canon EOS 90D Instruction Manual page 356

Selecting the AF Method (Live View Shooting)
Magnifi ed View
To check the focus when the AF method is other than [ u +Tracking],
magnify display by approx. 5× or 10× by pressing the < v > button (or
tapping < u >).
Magnifi cation is centered on the AF point for [Spot AF] or [1-point AF]

and on the Zone AF frame for [Zone AF].
Autofocusing is performed with magnifi ed display if you press the shutter

button halfway when set to [1-point AF], and [Spot AF]. When set to
other AF methods, autofocusing is performed after restoring normal
display.
With Servo AF, if you press the shutter button halfway in the magnifi ed

view, the camera will return to the normal view for focusing.
If focusing is diffi cult in the magnifi ed view, return to the normal view and
o
perform AF.
If you perform AF in the normal view and then use the magnifi ed view,
o
accurate focus may not be achieved.
AF speed diff ers between the normal view and magnifi ed view.
o
Continuous AF is not available when display is magnifi ed.
o
With the magnifi ed view, achieving focus becomes more diffi cult due to
o
camera shake. Using a tripod is recommended.
144