MT-24EX - Controlling slaves in groups A&B

I have 4 flashes right now, 580 EX II, 2x 430 EX II, and an MT-24EX.

I would like to be able to control the 3 "Normal" flashes using the MT-24EX with one in each group rather than having to put them all in group C as the manual indicates you have to do.

Before I bought all these flashes I would have sworn I read somewhere on these forums that it was possible to control external flashes in groups A&B using the MT-24EX, but I wasn't able to figure out how when I tried to test this, and I have searched the forums and have not been able to find the directions on how to do so.

Does anyone know if/how this can be done?

arentol wrote in post #12131935
I have 4 flashes right now, 580 EX II, 2x 430 EX II, and an MT-24EX.

I would like to be able to control the 3 "Normal" flashes using the MT-24EX with one in each group rather than having to put them all in group C as the manual indicates you have to do.

Before I bought all these flashes I would have sworn I read somewhere on these forums that it was possible to control external flashes in groups A&B using the MT-24EX, but I wasn't able to figure out how when I tried to test this, and I have searched the forums and have not been able to find the directions on how to do so.

Does anyone know if/how this can be done?

If you want to use the other flashes in groups A and B, you'll need to set C.Fn-5 on the MT-24EX to 1. The default is to only have external slaves in Group C.