Nikon D3400 - Quiet Shutter Release

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Choose this mode to keep camera noise to a minimum.
A beep
does not sound when the camera focuses.
1 Press the I (E/#) button.
2 Select J (Quiet shutter release).
Highlight J (Quiet shutter release)
and press J.
3 Take photographs.
Press the shutter-release button all
the way down to shoot.
Quiet Shutter Release
I (E/#) button