Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 283)

Sound Recording
Sound Recording/Sound-Recording Level
Wind Filter
Attenuator
You can record movies while recording sound with the built-in monaural microphone or an
external stereo microphone. You can also freely adjust the sound-recording level.
Use [
: Sound recording ] to set sound recording functions.
Caution
Sounds from Wi-Fi operations may be captured with built-in or external
microphones. During sound recording, using the wireless communication function
is not recommended.
When connecting an external microphone or headphones to the camera, be sure to
insert the plug all the way in.
If AF operations are performed or you control the camera or lens during movie
recording, the camera's built-in microphone may also record mechanical sounds of
the lens or sounds of camera/lens operations. In this case, using an external
microphone may reduce these sounds. If the sounds are still distracting with an
external microphone, it may be more effective to remove the external microphone
from the camera and position it away from the camera and lens.
Line input up to +6 dBV is supported, but levels higher than the standard input level
of –8 dBV may cause worse distortion. Taking test shots in advance is
recommended.
For line input, always set [
Sound rec. ] to [ Line input ]. Supplying audio when it is
not set to [ Line input ] may damage the camera.
Setting the sound recording option to [ Line input ] disables recording by the built-in
movie microphone. Additionally, [ Wind filter ] and [ Attenuator ] are not available.
Noise reduction is not applied to the audio played through headphones. Thus, the
audio recorded with the movie will be different.
Do not change the [
Manual ] or [ Line input ] settings when listening with
headphones. This may cause sudden loud output that may hurt your ears.
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