Canon EOS Rebel T5i 18-55mm IS STM Lens Kit Instruction Manual - Page 236
Set [Firing group] to, A:B]., Set the desired flash ratio and, take the picture.
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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 manual to set one slave unit's slave ID to A (Group A) and the other slave unit's A B ID to B (Group B), and position them as shown in the illustration. 1 Select [Wireless func.]. Follow step 2 on page 234 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). 236