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

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 Setting the Sound Recording
Wind filter
: When [Enable] is set, it reduces the wind noise when 
recording outdoors. This feature works only when you 
use the built-in microphone for movie shooting. Note 
that [Enable] reduces low bass sounds, so set it to 
[Disable] when there is no wind. It will record a more 
natural sound than with [Enable].
Attenuator
: Automatically suppresses sound distortion caused by 
loud noises. Even if [Sound rec.] is set to [Auto] or 
[Manual] for shooting, sound distortion may still result 
if there is a very loud sound. In such a case, setting it 
to [Enable] is recommended.
 
Using a microphone
Normally, the built-in microphone records monaural sound.
Stereo sound recording is possible by connecting an external stereo 
microphone equipped with a miniature stereo plug (3.5 mm 
diameter) to the camera’s external microphone IN terminal (p.29) as 
the external microphone is given the priority. Using the Directional 
Stereo Microphone DM-E1 (sold separately) is recommended.
 
Using headphones
By connecting headphones (commercially-available) equipped with 
a 3.5 mm diameter mini plug to the camera’s headphone terminal 
(p.29), you can listen to the sound during movie shooting. If you are 
using an external stereo microphone, you can listen to the sound in 
stereo. To adjust the headphones’ sound volume, press the <Q> 
button and select <n>. Then turn <5> to adjust the volume 
(p.350).
You can also use headphones during movie playback.
Wind Filter/Attenuator