Nikon D810 - Manual (Page 124)

100
Manual focus is available for lenses that do not support
autofocus (non-AF NIKKOR lenses) or when the autofocus does
not produce the desired results (0 99).
• AF lenses: Set the lens focus mode
switch (if present) and camera focus-
mode selector to M.
• Manual focus lenses: Set the camera focus-mode selector to M.
To focus manually, adjust the lens focus
ring until the image displayed on the
clear matte field in the viewfinder is in
focus. Photographs can be taken at any
time, even when the image is not in
focus.
Manual Focus
D AF Lenses
Do not use AF lenses with the lens focus mode switch set to M and
the camera focus-mode selector set to AF. Failure to observe this
precaution could damage the camera or lens. This does not apply to
AF-S lenses, which can be used in M mode without setting the
camera focus-mode selector to M.
Focus-mode selector