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

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Recording and Viewing Movies
3
Select Choose start/end point.
Press the 
P button, then highlight 
Choose start/end point and press 
2.
4
Select Start point.
To create a copy that begins from the 
current frame, highlight Start point 
and press 
J. The frames before the 
current frame will be removed when 
you save the copy in Step 9.
Start point
P button