Nikon D3100 User Manual page 22

16
Adjust Viewfinder Focus
The camera is equipped with diopter adjustment to accommodate individual
differences in vision. Check that the display in the viewfinder is in focus before
framing pictures in the viewfinder.
1
Remove the lens cap.
2
Turn the camera on.
3
Focus the viewfinder.
Rotate the diopter adjustment control until the
viewfinder display and focus point 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 point
• Adjusting Viewfinder Focus
If you are unable to focus the viewfinder as described above, select single-servo autofocus
(AF-S; 0 43), single-point AF
([u];
0 45), and the center focus point, and then frame a high-
contrast subject in the center focus point and press the shutter-release button halfway to
focus the camera. With the camera in focus, use the diopter adjustment control to bring the
subject into clear focus in the viewfinder. If necessary, viewfinder focus can be further
adjusted using optional corrective lenses.