Canon EOS Rebel T3i 18-135mm IS Lens Kit EOS REBEL T3i / EOS 600D Instruction - Page 196
A:B] Multiple slave units in multiple groups, Set [Firing group] to, A:B]., Set the desired flash
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Custom Wireless Flash Shooting [1 (A:B)] Multiple slave units in multiple groups Divide the slave units into groups A and B, and change the flash ratio to obtain the desired lighting effect. Refer to your Speedlite's instruction A B manual to set one slave unit's slave ID to A (Group A) and the other slave unit's ID to B (Group B) and position them as shown in the illustration. 1 Select [Wireless func.]. Follow step 2 on page 194 to select [0], then press . 2 Set [Firing group] to [1 (A:B)]. 3 Set the desired flash ratio and take the picture. Select [A:B fire ratio] and set the flash ratio. If [Firing group] is set to [1 (A:B)], group C will not fire. The 8:1 to 1:1 to 1:8 flash ratio is equivalent to 3:1 to 1:1 to 1:3 stops (1/2stop increments). 196