Nikon D780 DSLR Camera (Body Only) - Manual (Page 722)

676 Menu Guide > B The Setup Menu
• “ F ” will appear in the viewfinder and control panel
displays.
• To exit without acquiring Image Dust Off reference data,
press
G .
2
With the lens about ten centimeters (four inches)
from a well-lit, featureless white object, frame the
object so that it fills the display and then press the
shutter-release button halfway.
• In autofocus mode, focus will automatically be set to
infinity.
• In manual focus mode, set focus to infinity manually.