Canon EOS M EF-M 22mm STM Kit Instruction Manual page 122

Changing the Focusing Method
Notes About [u+Tracking], [FlexiZone - Multi], and
[FlexiZone - Single]
AF Operation
Even when focus has been achieved, pressing the shutter button
halfway will focus again.
The image brightness may change during and after the AF operation.
If the light source changes during autofocusing, the screen may flicker and focusing
may be difficult. If this happens, autofocus under the light to be used for shooting.
When [FlexiZone - Multi] is set and you tap on [
the zone (or screen center if automatic selection is set) 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 tap on [
the image at the AF point will be magnified. When you press the shutter
button halfway, the camera will focus while the magnified image is displayed
(however, if [AF operation] is set to [Servo AF], the display will return to
normal and then the camera will focus). This is effective when the camera is
attached to a tripod and you need to attain very precise focus. If focusing is
difficult in the magnified view, return to the normal display and use AF. Note
that the AF speed may differ between the normal and magnified views.
If you magnify the view after focusing with [FlexiZone - Multi] or
[FlexiZone - Single] in the normal view, it may not look focused.
If [u+Tracking] is set, magnified view is not possible.
About continuous shooting when [AF operation] is set to [Servo AF]:
When [u+Tracking] or [FlexiZone - Multi] is set, when you press the
shutter button halfway, the camera will focus and the AF point will be fixed.
When an EF-M lens is used, Servo AF will be used to focus; if an EF
or EF-S lens is used, focus lock will be used instead.
If you shoot a peripheral subject and it is slightly out of focus, aim the center AF
point or zone over the subject to focus, focus again and then take the picture.
When [FlexiZone - Multi] is set and AF is used to focus, depending on the
shooting conditions, it may take longer to focus the subject.
In magnified view, focusing using AF may be difficult due to the
magnified effect of camera shake. Using a tripod is recommended.
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] on the screen, the center of
] on the screen,