Nikon D4 Settings Manual page 44

Taking Photographs
Focus Point Selection and Aperture
The focus points available vary with the maximum aperture
of the lens.
40
Maximum aperture f/5.6 or faster: Focus
point selection is supported with all
51 points: 15 cross sensors ( ) at the
center of the display and 18 line sensors
( ) on either side.
Maximum aperture slower than f/5.6 but
faster than f/8 (e.g., a lens with a maxi-
mum aperture of f/4 on a TC-17E II
teleconverter): Focus point selection is
supported with 15 points: 9 cross sen-
sors at the center of the display and 3
line sensors on either side.
Maximum aperture f/8 (e.g., a lens with a
maximum aperture of f/4 on a TC-20E III
teleconverter): Focus point selection is
supported with 11 points: a cross sen-
sor at the center of the display, 4 line
sensors on either side, and 1 line sen-
sor above and below. The four points
shown by symbols are available only
for dynamic-area AF.