In the M mode, high-speed sync and second curtain sync functions can be
achieved.
• Optical S1 Secondary Unit Setting
In M manual flash mode, press the <
SLAVE
> button so that this flash can
function as an optic S1 secondary flash with optic sensor. With this function,
the flash will fire synchronously when the main flash fires, the same effect as
that by the use of radio triggers. This helps create multiple lighting effects.
• Optical S2 Secondary Unit Setting
Press the <
SLAVE
> button so that this flash can also function as an optic S2
secondary flash with optic sensor in M manual flash mode. This is useful when
cameras have pre-flash function. With this function, the flash will ignore a single
“preflash” from the main flash and will only fire in response to the second,
actual flash from the main unit.
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