Nikon D3X D3X User's Manual - Page 218
SB-900, and SU-800 provide AF-assist illumination when, 19 mm, 105 mm, 34 mm
UPC - 018208254422
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The SB-900, SB-800, SB-600, and SB-400 provide red-eye reduction in redeye 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. 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 106-135 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: 100 200 400 800 1600 l 4 4.8 5.6 6.7 8 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. 192