Canon Speedlite ST-E3-RT Mode D'emploi page 27

If the <D> lamp is red, radio transmission has not been established.
Check again the transmission channels and wireless radio IDs of the master
unit and slave unit. If you cannot connect with the same settings, turn the
power off and on again.
a: Fully Automatic Wireless Flash Shooting
5
Check the transmission status
and that the flash is ready.
Check that the <D> lamp is lit in
green.
When the slave flash is ready, the
AF-assist beam emitter blinks at
1-second intervals.
Check that the <Q> slave flash-ready
icon is lit on the master unit's LCD
panel.
When the recycling of all the flash
units is completed, the master unit's
charge lamp lights.
6 Check the operation.
Press the master unit's test flash
button (charge lamp).
The slave unit flashes. If the slave
unit does not fire, check that it is
placed within the operation range.
7
Take the picture.
Set the camera and take the picture,
in the same way as with normal flash
shooting.
If a standard flash exposure was
obtained, the flash exposure
confirmation lamp lights for 3 sec.
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