Nikon D6 Reference Manual page 1119

D
Attaching Diopter-Adjustment Viewfinder Lenses
Remove the DK-17F viewfinder eyepiece
before attaching a diopter-adjustment
viewfinder lens. Press the latches on both sides
of the eyepiece adapter simultaneously to
release the eyepiece lock (
the eyepiece as shown (
D
Removing the Eyepiece Adapter
Press and lift the latches on both sides
simultaneously (
w
shown ( ).
q ) and then unscrew
w ).
q ) and remove the adapter as
Other Compatible Accessories
1067