Nikon D800 User Manual (en)

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Adjusting Viewfinder Focus
If you are unable to focus the viewfinder as described above, select 
single-servo autofocus (AF-S; 
center focus point (
0 96), 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 (
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Diopter-Adjustment Viewfinder Lenses
Corrective lenses (available separately
can be used to further adjust viewfinder 
diopter. Before attaching a diopter-adjustment 
viewfinder lens, remove the DK-17 viewfinder 
eyepiece by closing the viewfinder shutter to 
release the eyepiece lock (q) and then 
unscrewing the eyepiece as shown at right (w).