Canon EOS Rebel T5 User Manual page 162

k Shooting Movies
When [Z1: AF w/ shutter button during k] is set to [Enable] (p.172),
pressing the shutter button halfway during movie shooting will execute
focusing. However, the following may occur.
• Focus may become far off momentarily.
• The brightness of the recorded movie may change.
• The recorded movie may be momentarily still.
• The movie may record the lens operation noise.
• You cannot shoot still photos when focus is not achieved, such as when
the subject is moving.
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