600EX-RT Disable Master

[Brian Cruickshank]

I have cross posted this on the Canon 5D forum since that's what the flash is paired with.

I am using my 600 EX-RT as a master to fire a 430EX slave in optical mode. Using the 600 EX, attached to a Canon 5D mk III, I can fire the 430EX and the 600 simultaneously with no problems. However no matter what I do, I cannot disable the master. I have tried to disable the master in two different ways, with the same result: Using the in-camera External Speedlight Contol, if I disable the master (icon indicates master is disabled), the master still fires. Alternatively, if I attempt to disable the master using the in-flash command (Menu 2) and the icon correctly says the master won't fire, it still does. In both cases, both the master and slave fire. Any ideas?

 

[OzanK]

The master always have to fire a small amount of light for optical communication with the slaves.

 

[Brian Cruickshank]

It seems like in either setting (master disabled vs enabled), the amount of flash appears the same. Test shots confirm this.

 

[OzanK]

As far as I know ... the communication flash is not noticable in the shot for the most cases. I think that it is a very low powered.

 

[Brian Cruickshank]

Someone in the Canon 5D forum solved the mystery: You cannot have Flash Group set to ALL. It must be set to either A:B or A:B C. Once I changed the Flash Group from ALL to A:B, then disabled the master, it worked perfectly.

 

[Jason Stoller]

I have cross posted this on the Canon 5D forum since that's what the flash is paired with.

I am using my 600 EX-RT as a master to fire a 430EX slave in optical mode. Using the 600 EX, attached to a Canon 5D mk III, I can fire the 430EX and the 600 simultaneously with no problems. However no matter what I do, I cannot disable the master. I have tried to disable the master in two different ways, with the same result: Using the in-camera External Speedlight Contol, if I disable the master (icon indicates master is disabled), the master still fires. Alternatively, if I attempt to disable the master using the in-flash command (Menu 2) and the icon correctly says the master won't fire, it still does. In both cases, both the master and slave fire. Any ideas?

 

[Jason Stoller]

Someone in the Canon 5D forum solved the mystery: You cannot have Flash Group set to ALL. It must be set to either A:B or A:B C. Once I changed the Flash Group from ALL to A:B, then disabled the master, it worked perfectly.

 

[Brian Cruickshank]

Thanks Jason….I did look at page 55, and it says nothing about changing the Flash Group from ALL to A:B. Maybe that's intuitive for some, but not me, apparently. Anyway, I appreciate everyone's input.

 

[Jason Stoller]

Thanks Jason….I did look at page 55, and it says nothing about changing the Flash Group from ALL to A:B. Maybe that's intuitive for some, but not me, apparently. Anyway, I appreciate everyone's input.

 

[cpharm86]

Thanks Jason….I did look at page 55, and it says nothing about changing the Flash Group from ALL to A:B. Maybe that's intuitive for some, but not me, apparently. Anyway, I appreciate everyone's input.