Canon Speedlite 600EX-RT - Manual (Page 40)

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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 on the subject, and the lighting balance
during wireless flash shooting (p.47, 75).
Press the depth-of-field preview button on the camera.
X The flash fires continuously for 1 sec.
You can return the settings of the Speedlite shooting functions and
wireless shooting settings to their default settings.
Press function buttons 2 and 3
simultaneously for 2 seconds or
longer.
X The Speedlite settings are cleared
and the settings return to normal
shooting and <a> flash mode.
Modeling Flash
Clearing Speedlite Settings
To avoid degrading and damaging the flash head due to overheating, do
not fire the modeling flash more than 10 times continuously. After firing it
10 times continuously, allow a rest time of at least 10 min.
If the modeling flash is fired more than 10 times continuously, the safety
function may activate and restrict flash firing. If this happens, allow a rest
time of at least 15 min.
Modeling flash is not possible when using the flash with EOS REBEL
2000/QD, EOS 300/QD or a Type-B camera.
During normal flash shooting, or when using the flash as the master unit in
wireless shooting, you can fire the modeling flash with the test flash button
(C.Fn-02/p.95).
Even when the settings have been cleared, the transmission channel and
wireless radio ID during wireless shooting as well as the C.Fn and P.Fn
settings (p.92) will not be canceled.
COP
Y