Nikon D3400 Kit Owner's Manual

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105
P, S, A, and M Modes
Mode M (Manual)
In manual mode, you control both shutter speed and aperture. 
Shutter speeds of “Bulb” and “Time” are available for long time-
exposures of moving lights, the stars, night scenery, or fireworks 
(
1
Rotate the mode dial to M.
Mode dial