Canon Speedlite Transmitter ST-E3-RT - Manual (Page 43)

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When the camera’s depth-of-field preview button is pressed, the flash
fires continuously for 1 sec. This is called the modeling flash. It enables
you to see the shadow effects of the flash on the subject and the lighting
balance.
Press the depth-of-field preview
button on the camera.
X The flash fires continuously for 1 sec.
With EOS digital cameras released since 2012, you can fire the
modeling flash from a flash set as a slave unit. For the operations, see
the flash’s instruction manual.
Modeling Flash
Modeling Flash from a Master Unit
Modeling Flash from a Slave Unit
With cameras released up to 2011, the modeling flash cannot be fired
from slave units.
To avoid degrading and damaging the flash head due to overheating, do
not fire the modeling flash more than 10 times continuously. After firing the
modeling flash 10 times continuously, allow a rest time of at least 10 min.
If the modeling flash is fired more than 10 times continuously, the flash’s
safety function may activate and restrict the flash firing. If this happens,
allow a rest time of at least 15 min.
Modeling flash is not possible when using the transmitter with EOS
REBEL 2000/QD or EOS 300/QD.
When two or more units are set to master, the master unit with the
<D> lamp lit in green is the one that fires.
You can fire the modeling flash with the test flash button (C.Fn-02/p.56).
COP
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