Canon ST-E3-RT-V2 Manual page 25

If the <D> lamp is red, radio transmission has not been established.
Check again the transmission channels and wireless radio IDs of the sender
unit and receiver 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 receiver flash is ready, the

AF-assist beam emitter blinks at
1-second intervals.
Check that the <Q> receiver flash-

ready icon is lit on the sender unit's
LCD panel.
When the recycling of all the flash

units is completed, the sender unit's
charge lamp lights.
6
Check the operation.
Press the sender unit's test flash

button (charge lamp).
The receiver unit flashes. If the
receiver 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.
25