Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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The Setup Menu: Camera Setup
Choose the pitch (High or Low) of the beep that sounds when 
the camera focuses and in self-timer and remote-control modes. 
Select Off to prevent the beep from sounding.
The current setting is shown in the 
information display: 
3 is displayed when 
the beep is on, 
2 when it is off.
Reduce flicker and banding when shooting under fluorescent or 
mercury-vapor lighting during live view (
0 39) or movie 
recording (
0 138). Choose Auto to allow the camera to 
automatically choose the correct frequency, or manually match 
the frequency to that of the local AC power supply.
Beep
G button
➜ B setup menu
Flicker Reduction
G button
➜ B setup menu
A
Flicker Reduction
If Auto fails to produce the desired results and you are unsure as to the 
frequency of the local power supply, test both 50 and 60 Hz options 
and choose the one that produces the best results. Flicker reduction 
may not produce the desired results if the subject is very bright, in 
which case you should select mode A or M and choose a smaller 
aperture (higher f-number) before starting live view. Note that flicker 
reduction is not available when On is selected for Movie settings > 
Manual movie settings (
0 142) in mode M.