02-10-2021 10:35 AM - edited 02-10-2021 10:37 AM
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!
02-10-2021 12:03 PM
Sounds like you've already done quite a bit of troubleshooting. I've never experienced this myself with the ST-E3-RT or any of the 600s (I have the original version 1 units).
Have you tried resetting the 600's to their default settings?
What mode are you using?
02-10-2021 04:34 PM
What came4a body are you using? Are you saying that you can maintain communication with a master, which I assume is mounted on your flash shoe.....but the communication to the slaves keeps dropping?
It sounds like you are in a very busy area, with lots of RFI. If you move to a less densely populated location, does it still drop?
02-10-2021 04:41 PM
04-16-2021 07:59 AM
In general I've found the radio really reliable. The link does go down when the transmitter goes to sleep but for me always comes back on when the camera wakes and wakes the transmitter.
There was a factory / service centre installed firmware update forthe Mk1 600EX-RT and also the ST-E3-RT that was mostly to do with stability of the radio link. They said it was more beneficial when using multiple lights, often more than 5. You can tell if your transmitter was updated by opening the battery door. Next to the hinge and above the right hand AA battery there should be a white paint dot on updated transmitters. There's also a serial number range to check.
I wrote this post on my website in the past, and had all my 600EX-RT and the ST-E3-RT updated at Canon UK's service centre for no cost. https://www.p4pictures.com/2015/12/canon-speedlite-600ex-rt-st-e3-rt-firmware-update/
08-09-2021 09:41 AM
Did you find a solution to this? I have tried different cameras, channels, and four flash combinations.
I haven't pulled them out in a few years, and am using the same settings I so reliably used before, based on saved memory configurations.