Nikon D810 - Manual (Page 47)

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❚❚ Detaching the Lens
Be sure the camera is off when removing
or exchanging lenses. To remove the
lens, press and hold the lens release
button (q) while turning the lens
clockwise (w). After removing the lens,
replace the lens caps and camera body
cap.
D CPU Lenses with Aperture Rings
In the case of CPU lenses equipped with an aperture ring (0 422), lock
aperture at the minimum setting (highest f-number).
A Diopter-Adjustment Viewfinder Lenses
Corrective lenses (available separately;
0 438) can be used to further adjust
viewfinder diopter. Before attaching a
diopter-adjustment viewfinder lens,
remove the viewfinder eyepiece by closing
the viewfinder shutter to release the
eyepiece lock (q) and then unscrewing the
eyepiece as shown at right (w).