Nikon d3s 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
Lift the diopter adjustment control
 
(q)
.
3
Focus the viewfinder.
Rotate the diopter adjustment control 
(w) until the viewfinder display, focus 
points, and AF area brackets are in 
sharp focus.
AF area brackets
Focus point