Nikon D3s Body Only D3S User's Manual - Page 217
Notes on Optional Flash Units Continued, Use Only Nikon Flash Accessories, the SB-900, SB-800
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D 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 AFassist 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 l is smaller than given above, the maximum value for aperture will be the maximum aperture of the lens. D 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. 191