Nikon 6MB07411-03 191, 17-19 mm 20-105 mm, 24-34 mm 35-49 mm, Use Only Nikon Flash Accessories

DNotes 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:

17–19 mm 20–105 mm 106–135 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 35–49 mm 50–105 mm

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:

200	400	800	1600	3200	6400	12800
4.8	5.6	6.7	8	9.5	11	13

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.

DUse 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.

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