Nikon D5000 User Manual page 29

I_ Notes on Optional Flash Units (Continued)
The SB-900, SB-800, SB-600, and SB-400 provide red-eye reduction, while the SB-900, SB-800,
SB-600, and SU-800 provide AF-assist illumination with the following restrictions:
• SB-900:Active AF-assist illumination is available for all
focus points; with 17-135 mm AF lenses, however,
autofocus is not available with the focus points shown in
gray.
• SB-800,SB-600 andSU-800:With 24-I 05 mm AF lenses, active
AF-assist illumination is not available with the focus
points shown in gray.
With other flash units, the camera AF-assist illuminator is
used for AF-assist illumination and red-eye reduction.
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