Nikon D6 Reference Manual page 1094

D
AF-S/AF-I Teleconverters and Available Focus Points
When an AF-S or AF-I teleconverter is attached, the focus points shown in
the illustrations can be used during viewfinder photography for
autofocus and electronic rangefinding (note that at maximum combined
apertures slower than f/5.6, the camera may not be able to focus on dark
or low-contrast subjects).
Teleconverter
TC-14E, TC-14E II, TC-14E III
TC-17E II
TC-20E, TC-20E II, TC-20E III
TC-14E, TC-14E II, TC-14E III
TC-17E II
TC-20E, TC-20E II, TC-20E III
TC-14E, TC-14E II, TC-14E III
1042 Compatible F Mount Lenses
Available focus points
Max. lens
(cross-sensor focus points
1
aperture
f/2
•
f/2.8 105 focus points
•
105 cross sensors
f/2.8
f/4
•
105 focus points
•
35 cross sensors
highlighted in gray
2
)