Nikon D300 User Manual page 388

D
Notes on Optional Speedlights
Refer to the Speedlight manual for detailed instructions. If the Speedlight
supports the Nikon Creative Lighting System, refer to the section on CLS-
compatible digital SLR cameras. The D300 is not included in the "digital
SLR" category in the SB-80DX, SB-28DX, and SB-50DX manuals.
i-TTL flash control can be used at ISO sensitivities between 200 and 3200.
At values over 3200, the desired results may not be achieved at some
ranges or aperture settings. If the flash-ready indicator blinks for about
three seconds after a photograph is taken, the flash has fired at full power
and the photograph may be underexposed.
The SB-900, SB-800, SB-600, and SB-400 provide red-eye reduction in red-
eye reduction and red-eye reduction with slow sync 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. With other flash units, the
camera AF-assist illuminator is used for AF-assist illumination. When used
with AF lenses with focal lengths of 17–135 mm, the SB-900 provides AF-
assist illumination (active AF-assist illumination) for all focus points; note,
however, that autofocus is available only with the following focus points:
17–19 mm
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:
24–34 mm
In programmed auto, the maximum aperture (minimum f-number) is
limited according to sensitivity (ISO equivalency), as shown below:
200
n
5
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.
362
20–105 mm
35–49 mm
Maximum aperture at ISO equivalent of:
400
5.6
106–135mm
50–105mm
800 1600
7.1 8
3200
10