Nikon D6 Reference Manual page 1109

•
At ISO sensitivities over 12800, the desired results may not be achieved
at some ranges or aperture settings.
•
In mode P, the maximum aperture (minimum f-number) is limited
according to ISO sensitivity, as shown below:
Maximum aperture (f-number) at ISO equivalent of:
100 200
4 5
* 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.
•
The SB-5000, SB-910, SB-900, SB-800, SB-700, SB-600, SB-500, and
SB-400 provide red-eye reduction in red-eye reduction and slow-sync
with red-eye reduction flash modes.
•
"Noise" in the form of lines may appear in flash photographs taken with
an SD-9 or SD-8A high-performance battery pack attached directly to
the camera. Reduce ISO sensitivity or increase the distance between the
camera and the battery pack.
•
The SB-5000, SB-910, SB-900, SB-800, SB-700, SB-600, and SU-800
provide AF-assist illumination as required.
400 800
5.6 7.1
1600 3200
8 10
Compatible Flash Units
6400 12800
11 13
1057