Nikon D780 Reference Manual page 211

A
AF-P Lenses
When an AF-P lens is used in manual focus mode, the in-focus indicator
will flash in the viewfinder (or in live view, the focus point will flash in the
monitor) to warn that continuing to rotate the focus ring in the current
direction will not bring the subject into focus.
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The Focal Plane Mark and Flange-Back Distance
Focus distance is measured from the focal
plane mark ( E ) on the camera body,
which shows the position of the focal
plane inside the camera (
when measuring the distance to your
subject for manual focus or macro
photography. The distance between the
focal plane and the lens mounting flange
is known as the "flange-back distance" (
back distance is 46.5 mm (1.83 in.).
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Focus Peaking
If focus peaking is enabled using Custom
Setting d11 [Peaking highlights], objects that
are in focus will be indicated by colored
outlines that appear when focus is adjusted
manually during live view. Note that peaking
highlights may not be displayed if the camera
is unable to detect outlines, in which case focus
can be checked by zooming in on the view through the lens in the display.
q ). Use this mark
w ). On this camera, the flange-
Shooting Settings
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