Scenarios I have tried:
Using Canon Transmitter ST-E3-RT as the master and (2) 600 EX II-RTs as slaves.
Using A 600EX as master and B 600EX as slave.
Using B 600EX as master and A 600EX as slave.
I get the same result of the slave dropping link. The time varies. Sometimes it drops link in 4 mins, sometimes 10mins, sometimes 20 or more minutes. The only way to relink them is by turning everything off and back on.
All channels are the same. Yes, I have scanned for the best connection as well as every other channel and AUTO.
All IDs are the same.
Not near a wifi-router or airport, I'm in a row home in Philadelphia.
Using NiMh rechargeables and using freshly charged batteries for every test. Batteries are about 2 years old.
I have spoken to 2 Canon service reps and neither of them has any idea what the problem is. I really don't have the money to spend on sending everything in for "repair".
Any help is greatly appreciated, thanks!
Solved! Go to Solution.
I'm experiencing the exact same issue - I've been using one 600 ex ii on-camera master and two of the same models as slaves. I've had them for about 5 years. I've tried switching them around and even added a brand new speedlite to the mix. I've tried multiple bodies (an R6, a Mark III, and a Mark IV). I've had them serviced by Canon multiple times now and still they are dropping the link - Canon says they are in perfect working order. It's immensely frustrating given the amount of time I've spent going into Canon HQ - not to mention how unreliable the flashes are at a wedding! I don't know what else to do at this point. Thanks!
I've been using my new flashes successfully for a couple months and last night the links dropped again and I couldn't get them to connect for longer than a minute. I suspect there's an interference like other people have mentioned; there were a ton of wireless lights and sound equipment around. Going to try Yongnuo flashes instead. I'd try the Godox system w the 600s but I'm reading reviews on B&H that they don't work with the Canon R6 camera.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.