Nikon D5300 - Manual (Page 68)

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