Nikon D6 - Page 227

175
Choosing How the Camera Focuses (Focus)
D
Using Manual Focus with AF Lenses (AF-S and AF-P Lenses
Excluded)
Be sure to rotate the camera focus-mode selector to M when using
manual focus with AF lenses (AF-S and AF-P lenses excepted). Attempting
to focus manually with the focus-mode selector set to AF could damage
the camera or lens.