Nikon D5100 Reference Manual page 50

The following features are available with CLS-compatible flash units:
AF-assist f or multi-area AF2
Flash ColorInformation Communication
Power zoom
I Only available when SU-800 is used to control other flash units. The SU-800 itself is not equipped with
a flash.
2 CPU lens required.
3 Standard i-TTL flash for digital SLR is used with spot metering or when selected with flash unit.
4 Standard i-TTL flash for digital SLR is used with spot metering.
5 Selected with flash unit.
6 Auto aperture (AA) is used regardless of mode selected with flash unit.
7 Can be selected with camera.
II OtherFlashUnits
The following flash units can be used in non-TTL auto and manual modes.
_u_i: L. ::::_ _ Flashunit _°°`S_B_°D_X_S_B:28`D_X;_S_B_8_T°=_:_::!_:°_°°_7I_u_`_S`B_3-_S_B:27°z<_S_B:22S7_ °-_B-°_;_B-°_9-_,= ....
SB-26,SB-25, SB-24 _ SB-5ODX' _SB-22,SB-20,SB-16B, SB-15 SB-21B%SB-29S'
,,, _ ,,, _
K v
,, _ _ _
1 Select mode P,S,A, or M, lower built-in flash, and use optional flash unit only.
;7 Flash mode is automatically set to TTL and shutter-release is disabled. Set flash unit to A (non-TTL auto
flash).
3 Autofocus is available with AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED and AF-S Micro NIKKOR 60mm
f/2.8G ED lenses only.
4 Available when camera is used to select flash mode.
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