Nikon D300 User Manual (en)

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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 shooting.
1
Turn the camera on.
Remove the lens cap and turn 
the camera on.
2
Focus the viewfinder.
Rotate the diopter control 
until the viewfinder display, 
focus points, and AF area 
brackets are in sharp focus. 
When operating the diopter 
control with your eye to the 
viewfinder, be careful not to 
put your fingers or fingernails 
in your eye.
A
Adjusting Viewfinder Focus
If you are unable to focus the viewfinder as described above, select single-
point AF (
K) and rotate the focus mode selector to S, then frame a high-
contrast subject in the center focus point and focus using autofocus. With 
the camera in focus, rotate the diopter control until the subject is clearly 
focused in the viewfinder. If necessary, viewfinder focus can be further 
adjusted using optional corrective lenses (pg. 366).
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