topic Re: Speedlite 600EX II-RT Losing Link with ST-E3-RT in Speedlite Flashes

Speedlite 600EX II-RT Losing Link with ST-E3-RT

Tiggmeister — Tue, 22 Nov 2022 20:59:17 GMT

When using the above Speedlites with the ST-E3-RT transmitter in Groups A/B Manual I can shoot a couple images then the links break and I have to shut off the units, wait 15 seconds then turn them back on again to link back up. It doesn't do this in ETTL. Is this a known issue and is there a fix?

Re: Speedlite 600EX II-RT Losing Link with ST-E3-RT

F1Jds — Tue, 28 Feb 2023 00:28:41 GMT

Had same problem. Happened all at once whether or not I used a 600 EX as the master or ST-E3-RT. I figured everything couldn't have broke at once. I switched all four 600's over to optical and fired a couple shots using one of the flashes as the master. I didn't like working this way so I turned off everything in my house that I thought could transmit RF, wi-fi router, smart TVs, AppleTV boxes etc. then switched the 600's and ST transmitter back to radio control. After that the 600-RTs and ST-E3-RT worked perfect. When I turned on the wi-fi router and all the other stuff the flash and transmitter stopped linking again. When I have more time I'll experiment and see if I can find the specific device that's causing the problem. Will also mess around with choosing other channels on the flash and transmitter. I'm not sure if going to optical and back needs to be done to reset everything in the flashes after they get corrupted by whatever is messing them up. Hope this works for you.

Re: Speedlite 600EX II-RT Losing Link with ST-E3-RT

ncolarusso — Fri, 16 Jan 2026 17:57:16 GMT

Hi. Did you ever find what was causing the issue? Thanks