D At:selecting The Flash Tube - Canon MR-14EXl Instructions Manual

~~D at:Selecting the Flash Tube
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By firing only one of the flash tubes or by setting a flash ratio for flash tubes
A and B, you can create shadows and sculptural lighting effects. You can
set the flash ratio from 1:8 to 1:1 to 8:1 (13 levels) in 1/2-stop increments.
*
The
ETTL
flash mode must be set.
*
Since the flash exposure is controlled automatically, you need not bother with any
flash metering calculations.
* If you set the flash mode to M, see page 39.
The flash tube ID is "A" for the left one and "B" for
the right one when you look at the rear of the flash
ring. '
26
A:B=1:1
Only flash tube A fired.
A:B=4:1
Only flash tube B fired.