Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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 Shooting Movies
When the shooting mode is <s>, you can manually set the shutter 
speed for movie shooting. The ISO speed and aperture will be set 
automatically to suit the brightness and obtain the standard exposure.
1
Set the Mode Dial to <s>.
2
Set the Live View shooting/Movie 
shooting switch to <
k>.
3
Set the desired shutter speed.
 
While looking at the LCD monitor, 
turn the <6> dial.
 
The settable shutter speeds depend 
on the frame rate. See page 343.
4
 Focus and shoot the movie.
 
The procedure is the same as steps 3 
and 4 for “Autoexposure Shooting” 
(p.334).
 Shutter-priority AE
Shutter speed
 
Changing the shutter speed during movie shooting is not recommended 
since the changes in the exposure will be recorded.
 
When shooting a movie of a moving subject, a shutter speed of approx. 
1/25 sec. to 1/125 sec. is recommended. The faster the shutter speed, 
the less smooth the subject’s movement will look.
 
The minimum shutter speed for shooting movies at a high frame rate will 
be 1/125 sec. for NTSC and 1/100 sec. for PAL.
 
If you change the shutter speed while shooting under fluorescent or LED 
lighting, image flicker may be recorded.