Nikon D2Xs Manual page 131

Notes on Optional Speedlights
Refer to the Speedlight manual for detailed instructions. If the Speedlight supports
i-TTL or D-TTL fl ash control, refer to the entry for cameras that support the Creative
Lighting System (CLS) or for digital SLR cameras in the table of camera types.
If Auto FP High-Speed Sync is not used, the shutter will synchronize with an external
fl ash at speeds of ½ s or slower.
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If the fl ash-ready indicator blinks for about three seconds after a photograph is taken
with i-TTL or D-TTL fl ash control, the fl ash has fi red at full power and the photograph
may be underexposed.
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The SB-28DX displays exposure in increments of 1 EV. If the camera is set to control
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exposure in increments of ½ EV using Custom Setting b2, the SB-28DX exposure dis-
play will not show the correct ISO value. The actual exposure value is not affected.
i-TTL and D-TTL fl ash con trol can be used to adjust fl ash out put at ISO sensitivity set-
tings be tween 100 and 800. At settings over ISO 800, the desired re sults may not be
achieved at some ranges or aperture settings.
The AF-assist il lu mi na tor on CLS-compatible Speedlights will only light if all of the fol-
low ing con di tions are met: focus mode is set to single-servo auto, an AF-Nikkor lens is
used, the subject is poorly lit, and the center focus area is selected or dynamic-area AF
is used in com bi na tion with clos est-subject priority.
In programmed auto, the maximum aperture (minimum f/-number) is lim it ed ac-
cord ing to ISO sensitivity, as shown below:
Maximum aperture at ISO equivalent of:
100 125 160 200 250 320 400 500 640 800
4 4.2 4.5 4.8 5 5.3 5.6 6 6.3 6.7
For each one-step increase in ISO 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 fl ash photography,
correct exposure may not be achieved in i-TTL or D-TTL mode. We recommend that
you choose spot metering to select standard i-TTL or D-TTL fl ash control. Take a test
shot and view the results in the monitor.
In i-TTL or D-TTL mode, use the fl ash panel or bounce adapter provided with your
Speedlight. Do not use other panels such as diffusion panels, as this may produce
incorrect exposure.
D-TTL fl ash control can not be used for multi-fl ash photography.
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