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Godox TT685IIC Manual page 6

Thinklite ttl camera flash

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The flash output is adjustable from 1/1 full power to 1/256th power
in 1/10th stop increments. To obtain a correct flash exposure, use
a hand-held flash meter to determine the required flash output.
Optic S1 Secondary Unit Setting
In M manual flash mode, press <S1/S2> 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.
Optic S2 Secondary Unit Setting
Press <S1/S2> 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.
● S1 and S2 optic triggering is only available in M manual
flash mode.
1
Press < MODE > button so
that < M > is displayed.
2
Turn the Select Dial to
choose a desired flash
output amount.
2
Press Set Button again to
confirm the setting.
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With stroboscopic flash, a rapid series of flashes is fired. It can be
used to capture a multiple images of a moving subject in a single
photograph.
You can set the firing frequency (number of flashes per sec.
expressed as Hz), the number of flashes, and the flash output.
Calculating the Shutter Speed
During stroboscopic flash, the shutter remains open until the firing
stops. Use the formula below to calculate the shutter speed and set
it with the camera.
Number of Flashes / Flash Frequency = Shutter Speed
For example, if the number of flashes is 10 and the firing frequency
is 5 Hz, the shutter speed should be at least 2 seconds.
To avoid overheating and deteriorating the flash head, do
not use stroboscopic flash more than 10 times in
succession. After 10 times, allow the camera flash to rest
for at least 15 minutes. If you try to use the stroboscopic
flash more than 10 times in succession, the firing might
stop automatically to protect the flash head. If this
happens, allow at least 15 minutes' rest for the camera
flash.
●Stroboscopic flash is most effective with a highly
reflective subject against a dark background.
●Using a tripod and a remote control is recommended.
●A flash output of 1/1 and 1/2 cannot be set for
stroboscopic flash.
●Stroboscopic flash can be used with"buLb".
●If the number of flashes is displayed as "--", the firing
will continue until the shutter closes or the battery is
exhausted. The number of flashes will be limited as
shown by the following table.
1
Press <MODE> button so that
<
> is displayed.
2
Set the flash frequency and
flash times.
● Press the Function Button
2 <Times> to select the flash
times. Turn the Select Dial to
set the number.
● Press the Function Button
3 <Hz> to select the flash
frequency. Turn the Select Dial
to set the number.
3
Turn the Select Dial to choose
a desired flash output.
After you finish the setting,
press Set Button and all the
settings will be displayed.
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