Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 296)

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Setting the Sound Recording
Attenuator
Automatically suppresses sound distortion caused by loud noises. Set
[Sound rec.] to [Enable] if distortion occurs when set to [Auto] or [Manual] .
External Microphone
If an external microphone equipped with a miniature stereo plug (3.5 mm
diameter) is connected to the camera’s external microphone IN terminal, the
external microphone will be given the priority. Using the Directional Stereo
Microphone DM-E1 (sold separately) is recommended.
Headphones
By connecting commercially available headphones with a 3.5 mm mini
plug to the headphone terminal, you can listen to the sound as movies are
recorded or played back. To adjust headphone volume, access
[
5
: Headphone volume] ( = 523), or press the <
Q
> button, select [
n
] ,
then adjust with the <
Y
> <
Z
> keys.