Nikon D300s - Manual (Page 377)

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D 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.
In programmed auto, the
maximum aperture (minimum f-
number) is limited according to
sensitivity (ISO equivalency), as
shown at right.
D Use Only Nikon Flash Accessories
Use only Nikon flash units. Negative voltages or voltages over 250 V
applied to the accessory shoe could not only prevent normal operation,
but damage the sync circuitry of the camera or flash. Before using a
Nikon flash unit not listed in this section, contact a Nikon-authorized
service representative for more information.
17–19 mm 20–105 mm 106–135 mm
24–34 mm 35–49 mm 50–105 mm
Maximum aperture at ISO equivalent of:
200 400 800 1600 3200
5 5.6 7.1 8 10