Nikon D5100 Reference Manual page 51

_I_ 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 D51 O0 is not included in the
"digital SLR" category in the SB-8ODX, SB-28DX, and SB-5ODX manuals.
If an optional flash unit is attached in shooting modes other than _, [], and 7, the flash will
fire with every shot, even in modes in which the built-in flash can not be used. Note that
optional flash units can not be used while HDR is in effect.
i-TTL flash control can be used at ISO sensitivities between 100 and 6400. At values over
6400, 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
aanels such as diffusion panels, as this may produce incorrect exposure.
If the controls on the optional SB-900, SB-800, SB-700 or SB-600 flash unit or SU-800 wireless
Speedlight commander are used to set flash compensation, pl_ will appear in the
information display.
The SB-900, SB-800, SB-700, SB-600, and SB-400 provide red-eye reduction, while the SB-900,
SB-800, SB-700, 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.
= = = = = , = = = = =
17-I05mm I06-135mm
• SB-800,SB-600andSU-800:With 24-105 mm AF lenses, AF- _ . ,,
assist illumination is available only with the focus points = =
shown at right. _ ,, "
24-34 mm
• SB-700:AF-assist illumination is available for all focus
points; with 24-135 mm AF lenses, however, autofocus
is available only with the focus points shown at right.
_. = _=_ = _.
35-I05mm
24-135 mm
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