Nikon D850 - Page 120

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A 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 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).
Teleconver ter
Max. lens
aperture
1
Available focus points (cross-sensor
focus points highlighted in gray
2
)
TC-14E, TC-14E II, TC-14E III
TC-17E II
TC-20E, TC-20E II, TC-20E III
f/2
153 focus points (55
selectable) with 99 cross
sensors
TC-14E, TC-14E II, TC-14E III f/2.8
TC-17E II
TC-20E, TC-20E II, TC-20E III
f/2.8
153 focus points (55
selectable) with 45 cross
sensors
TC-14E, TC-14E II, TC-14E III f/4
TC-17E II f/4
37 focus points (17
selectable) with 25 cross
sensors
TC-800-1.25E ED f/5.6