Focus The Viewfinder - Nikon D3400 Reference Manual

Focus the Viewfinder

After removing the lens cap,
rotate the diopter adjustment
control until the focus points
are in sharp focus. When
operating the control with
your eye to the viewfinder, be
careful not to put your fingers
or fingernails in your eye.
Focus points
Viewfinder not in focus Viewfinder in focus
26 First Steps