Nikon D3400 Reference Manual - English - Page 50
Focus the Viewfinder, careful not to put your fingers
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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
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26
First Steps
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