Nikon D3000 - Manual (Page 183)

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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: 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 and SU-800: With 24–105 mm AF lenses, 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.
17–105 mm 106–135 mm
24–34 mm 35–105 mm