Nikon D800 - Manual (Page 126)

En_03
102
N
The Electronic Rangefinder
If the lens has a maximum aperture of f/5.6
or faster, the viewfinder focus indicator can
be used to confirm whether the subject in
the selected focus point is in focus (the
focus point can be selected from any of the
51 focus points). After positioning the
subject in the selected focus point, press
the shutter-release button halfway and
rotate the lens focus ring until the in-focus
indicator (
I) is displayed. Note that with
the subjects listed on page 100, the in-
focus indicator may sometimes be
displayed when the subject is not in focus;
confirm focus in the viewfinder before
shooting.
A
Focal Plane Position
To determine the distance between
your subject and the camera, measure
from the focal plane mark (
E) on the
camera body ( 0 2). The distance
between the lens mounting flange and
the focal plane is 46.5 mm (1.83 in.).
Focal plane mark
46.5 mm