Nikon D3300 User Manual page 179

8
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.
Viewfinder not in focus
D
During Charging
Do not move the charger or touch the battery during charging. Failure
to observe this precaution could in very rare instances result in the
charger showing that charging is complete when the battery is only
partially charged. Remove and reinsert the battery to begin charging
again.
20 Introduction
Focus points
Viewfinder in focus