Nikon D850 User Manual page 318

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Notes on Optional Flash Units (Continued)
The SB-5000, SB-910, SB-900, SB-800, SB-700, SB-600, SB-500, and
SB-400 provide red-eye reduction, while the SB-5000, SB-910, SB-900,
SB-800, SB-700, SB-600, and SU-800 provide AF-assist illumination
with the following restrictions:
• SB-5000: AF-assist illumination is available when 24–135 mm AF lenses are
used with the focus points shown below.
24–49 mm
• SB-910 and SB-900: AF-assist illumination is available when 17–135 mm
AF lenses are used with the focus points shown below.
• SB-800, SB-600, and SU-800: AF-assist illumination is available when 24–
105 mm AF lenses are used with the focus points shown below.
24–34 mm
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Focal length
50–84 mm
Focal length
17–19 mm
Focal length
35–49 mm
85–135 mm
20–135 mm
50–105 mm