S1 and S2 Optical Mode
In <M> manual mode, the flash can function as optic S1 and S2
with optic sensor.
In <S1> mode, the slave unit will auto flash immediately when the
master flash fires.
In S2 mode, the unit will neglect the pre-flash and only fire in response
to the second main flash.
Auto Standby
It will go to sleep mode after 20 or 60 minutes of idle use. To wake up
the flash again, press any button. “Auto Standby” can also be
disabled by set it to “OF”.
Constant Color Mode
When constant color temperature mode is active <ON>, despite
variation of flash output power or high-speed sync, the color
temperature of the flash remains 5600±100K.
When constant color temperature mode is inactive <OF>, flash
duration is the first concern, and color temperature varies. Flash
duration can reach 1/10000s, which can be used for freezing fast
moving object.
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