Nikon D4S - Manual (Page 426)

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The AF-S/AF-I Teleconverter
The table below shows the focus points available for autofocus and
electronic rangefinding when an AF-S/AF-I teleconverter is attached.
Note that the camera may be unable to focus on dark or low-contrast
subjects if the combined aperture is slower than f/5.6. Autofocus is not
available when teleconverters are used with the AF-S VR Micro-Nikkor
105mm f/2.8G IF-ED.
1 Single point AF is used when 3D-tracking or auto-area AF is selected for
AF-area mode ( 0 100).
2 Autofocus not available.
3 Focus data for focus points other than the center focus point are obtained
from line sensors.
Accessory
Maximum
aperture of
lens
Focus points
TC-14E,
TC-14E II
f/4 or
faster
f/5.6
TC-17E II
f/2.8 or
faster
f/4
f/5.6 —
1
1
2
TC-20E,
TC-20E II,
TC-20E III
f/2.8 or
faster
f/4
f/5.6 —
TC-800-
1.25E ED
f/5.6
Accessory
Maximum
aperture of
lens
Focus points
3
2
1