Nikon D780 DSLR Camera (Body Only) - Manual (Page 379)

333 Other Shooting Options
• To choose the amount the focus distance changes with
each shot
:
- A value of 5 or less is recommended, as higher settings
increase the risk that some areas will be out of focus when
the shots are stacked. Try experimenting with different
settings before shooting.
Highlight [ Focus step width ]
and press 2 .
Press 4 to reduce the focus
step width, 2 to increase.
Press J to proceed.