Nikon D3X 17–19mm, 20–105mm, Maximum aperture at ISO equivalent of:

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 (active AF-assist illumination) for all focus points; note, however, that autofocus is available only with the following focus points:

17–19 mm 20–105 mm 106–135mm

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 35–49 mm 50–105mm

In programmed auto, the maximum aperture (minimum f-number) is limited according to sensitivity (ISO equivalency), as shown below:

Maximum aperture at ISO equivalent of:

		100	200	400	800	1600
	4		4.8	5.6	6.7	8
l

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.

When an SC-series 17, 28, or 29 sync cable is used for off-camera flash photography, correct exposure may not be achieved in i-TTL mode. We recommend that you choose spot metering to select standard i-TTL flash control. Take a test shot and view the results in the monitor.

In i-TTL, use the flash panel or bounce adapter provided with the flash unit. Do not use other panels such as diffusion panels, as this may produce incorrect exposure.

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