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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 in
red-eye reduction and slow sync with red-eye reduction modes, while
the SB-900, SB-800, SB-600, and SU-800 provide AF-assist illumination
when the conditions for AF-assist illumination are met.
When used with
AF lenses with focal lengths of 17–135 mm, the SB-900 provides AF-
assist illumination for all focus points; note, however, that autofocus is
available only with the following focus points:
When used with AF lenses with focal lengths of 24–105 mm, the SB-800,
SB-600, and SU-800 provide AF-assist illumination to assist autofocus for
the following focus points:
In programmed auto, the maximum aperture (minimum f-number) is
limited according to sensitivity (ISO equivalency), as shown below:
For each one-step increase in sensitivity (e.g., from 200 to 400), aperture
is stopped down by half an f-stop. If the maximum aperture of the lens
is smaller than given above, the maximum value for aperture will be the
maximum aperture of the lens.
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 6400 12800
4.8 5.6 6.7 8 9.5 11 13
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