Nikon d3s User Manual (en)

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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.
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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
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