Canon EOS 5DS (no lens included) Owner's Manual

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z4
When the Live View shooting/Movie 
shooting switch is set to <k>, the 
movie shooting menu options will appear 
under the [z4] and [z5] tabs (the 
[z2] and [z3] tabs in <A>).
 
Movie Servo AF
During movie shooting, the camera focuses on the subject 
continuously. The default setting is [Disable].
When [Enable] is set:
y
The camera focuses on the subject continuously even when you 
are not pressing the shutter button halfway.
y
Since this drives the lens continuously, it will consume battery 
power and shorten the total possible movie shooting time (p.291).
y
With certain lenses, the lens operation noise during focusing may 
be recorded. If this happens, use an external microphone 
(commercially available) to reduce lens operation noise in the 
movie.
y
If you want to set the lens’s focus mode switch to <MF> during 
Movie Servo AF, first set the Live View shooting/Movie shooting 
switch to <A>.
3
 Menu Function Settings