Nikon D780 DSLR Camera (Body Only) - Manual (Page 397)

351 Other Shooting Options
Entering Lens Data
1
Select Non-CPU lens data.
Highlight [ Non-CPU lens data ] in the
setup menu and press 2 .
2
Select a lens number.
Highlight [ Lens number ] and press
4 or 2 to choose a lens number.
3
Enter the focal length and
aperture.
Highlight [ Focal length (mm) ] or
[ Maximum aperture ] and press 4 or
2 to edit the highlighted item.
4
Save settings and exit.
Press J . The specified focal length and aperture will be
stored under the chosen lens number.