Yongnuo Speedlite YN968EX-RT for Cameras - Manual (Page 16)

Short press the button [ ] until displays the
[ ] and [ ] . Select a trigger mode when
press the function button 4 [MENU] displays the
SC/SN/SC&SN/S1/S2 trigger modes*. Please
allow the wireless trigger sensor face to the
master flash by rotating the flash head. Before
shooting, the slave unit and master unit should
be set on the same channel.
SLAVE
Zoom mm
20
0.3
M M
MENU1 Zm C.Fn
SLAVE
Zoom mm
20 M
MENU1 Zm C.Fn
A
Sc
Gr
CH 1
ETTL
S C /SN mode can respectively receive the built-in flash of the YN568EX
II/580EXII/7D/60D/600D,SB-910/900/800/700, commander mode of Nikon
camera, supports 4 channels, realizing TTL and manual flash.
Before shooting, the slave unit and master unit should be set on the same
channel. S1 and S2 mode are suitable for MANUAL flash environment and TTL
flash environment respectively. Under these two modes, the way to adjust
the output is like that in M mode only by the function button
[ ] and
rotate the [ ] .
S C : Indicating that it can only receive wireless signal from Canon system,
avoiding Nikon system.
SN: Indicating that it can only receive wireless signal from Nikon system,
avoiding Canon system.
SC & SN ： Both support Canon & Nikon system.
S1 mode: In this mode it will work with the first flash synchronously of the
master flash, with the result consistent with the use of radio slave. To use this
mode properly, the master flash should be set at manual flash and the TTL
flash system with preflight function and the red-reduction function with
multiple flashes should not be used.
S2 mode: It is also called "pre-flash cancel mode". This mode is similar with
S1 mode, but it can neglect the pre-flash given by TTL flash. Therefore, it can
support the master flash working in TTL mode. In particular, if S1 mode
cannot flash properly and synchronically with your internal flash, you can try
to use S2 mode.
*
Commonly used trigger mode can be set by C . Fn - 25 .
Wireless Flash Shooting: Optical slave mode
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Indoors Outdoors