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D Notes on Optional Flash Units
Refer to the Speedlight manual for detailed instructions.
If the flash unit supports CLS, refer
to the section on CLS-compatible digital SLR cameras.
The D3100 is not included in the
“digital SLR” category in the SB-80DX, SB-28DX, and SB-50DX manuals.
If an optional flash unit is attached in shooting modes other than j, the flash will fire with
every shot, even in modes in which the built-in flash can not be used (l and m).
i-TTL flash control can be used at ISO sensitivities between 100 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.
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.
If the controls on the optional SB-900, SB-800, SB-600, or SU-800 flash unit are used to set
flash compensation, Y will appear in the information display.
The SB-900, SB-800, SB-600, and SB-400 provide red-eye reduction, while the SB-900, SB-800,
SB-600, and SU-800 provide AF-assist illumination with the following restrictions:
• SB-900: AF-assist illumination is available for all focus
points; with 17–135 mm AF lenses, however, autofocus
is available only with the focus points shown at right.
• SB-800, SB-600 and SU-800: With 24–105 mm AF lenses, AF-
assist illumination is available only with the focus points
shown at right.
With other flash units, the camera AF-assist illuminator is
used for AF-assist illumination and red-eye reduction.
17–105 mm 106–135 mm
24–34 mm 35–105 mm