Canon EOS Rebel T4i 18-135mm IS STM Lens Kit Instruction Manual page 192

3 Movie Menu Function Settings
• If you want to hold the focus at a certain point or avoid recording
the lens operation noise before or during movie shooting, you
can temporally stop Movie Servo AF by performing one of the
operations below. When you stop Movie Servo AF, the AF point
will turn gray. When you perform the same operation again,
Movie Servo AF will resume.
• Press the <D> button.
• Tap the [
• If [6: Shutter/AE lock button] is set to [2: AF/AF lock, no AE
lock] in the [54: Custom Functions (C.Fn)], Movie Servo AF
will stop while you hold down the <A> button. When you let go
of the <A> button, Movie Servo AF will resume.
• When you press the <M> or <x> button, change the AF
method, or operate the lens focus mode switch, Movie Servo AF
is stopped. It will resume when you return to movie shooting.
• For cautions when [Movie servo AF] is set to [Enable], see
page 197.
• When [Disable] is set:
• You can focus only when the shutter button is pressed halfway.
AF with shutter button during k (movie recording)
When you press the shutter button while shooting a movie, you can
shoot a still photo. The default setting is [ONE SHOT].
• When [ONE SHOT] is set:
• You can refocus and shoot a still photo by pressing the shutter
button halfway while shooting a movie.
• When shooting a static subject (not moving), you can perform
shooting in precise focus.
• When [Disable] is set:
• You can immediately start shooting a still photo by pressing the
shutter button, even though focus is not achieved. It is effective
when you want give priority to the shutter chance rather than to
focus.
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] icon on the lower left of the screen.