Yongnuo YN568EX User Manual download pdf (Page 15)

S1 and S2 modes are suitable for MANUAL flash environment and TTL flash environment respectively. Under

these two modes, the way to adjust the output level is like that in M mode.

S1 mode: It will work with the first work of the master flash synchronously,

with the result consistent with the use of radio slave. To use this mode

correctly, 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 main flash working in TTL mode. In particular, if S1 mode

cannot flash correctly and synchronically with your internal flash, you can try

to use S2 mode.

The following situation shall be avoided when the S1 and S2 modes are used:

the red eye reduction function of the main light is used; the order mode

(nikon) or wireless mode (canon) of the main light is used; the ST-E2 is used as the flash controller. Otherwise,

please set the speedlite as Sc/Sn.

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Yongnuo YN568EX User Manual Page 15