Nikon D90 User Manual page 257

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Notes on Optional Speedlights
Refer to the 5peedlight manual for detailed instructions. If the Speed light supports the Nikon
Creative Lighting System, refer to the section on CL5-compatible digital 5LR cameras. The D90
is not included in the "digital 5LR" category in the 5B-80DX, 5B-28DX, and 5B-50DX manuals.
If an optional flash unit is attached with the camera in modes other than \1}, the flash will fire
whenever a photograph is taken. The following flash modes are available:
•
A~O, -7, and ~ modes:
Fill flash and red-eye reduction. Fill flash is automatically selected if the
flash mode is set to off or auto when an optional flash unit is attached. Auto with red-eye
reduction becomes red-eye reduction .
• IZJ mode:
Auto slow sync becomes slow sync, auto slow sync with red-eye reduction becomes
slow sync with red-eye reduction, and off becomes slow sync.
i-TTL flash control can be used at ISO sensitivities between 200 and 3200. At values over 3200,
the desired results may not be achieved at some ranges or aperture settings. If the flash-ready
indicator blinks for about three seconds after a photograph is taken, the flash has fired at full
power and the photograph may be underexposed.
The 5B-900, 5B-800, 5B-600, and 5B-400 provide red-eye reduction, while the 5B-900, 5B-800,
5B-600, and 5U-800 provide AF-assist illumination. With other 5peedlights, the camera AF-assist
illuminator is used for AF-assist illumination and red-eye reduction. When used with AF lenses
with focal lengths of 17-135 mm, the 5B-900 provides active AF-assist illumination for all focus
points; note, however, that autofocus is available only with the following focus points:
17-105 mm
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106-135mm
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When used with AF lenses with focal lengths of 24-1 05 mm, the 5B-800, 5B-600 and 5U-800
provides active AF-assist illumination to assist autofocus for the following focus points:
24-34mm
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35-105mm
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In programmed auto, the maximum aperture (minimum f-number) is limited according to
sensitivity (ISO equivalency), as shown below:
Mode
··········AUTO·····~······~····::.i~······F.,ji···;········ ...
P,
o,;f.,., "",
lo&J
4
8
Maximum aperture at
ISO
sensitivity of
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·,,,·w·~··,,
...
· · · y . . __ y
400 800 1600
4.8 5.6 6.7
9.5 11 13
3200
8
16
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 5C-series 17,28, or 29 sync cable is used for off-camera flash photography, correct
iii
exposure may not be achieved in i-TTL mode. We recommend that you choose spot metering
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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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