topic Speedlite Transmitter ST-E10 and R5c Compatibility in Speedlite Flashes

Speedlite Transmitter ST-E10 and R5c Compatibility

thefunkmobile — Fri, 03 Apr 2026 00:01:14 GMT

I attempted to use the Speedlite Transmitter ST-E10 with the Canon R5c, but unfortunately, it didn’t function as expected. The ST-E10 fails to communicate with the R5c in photo mode, although it is recognized as an accessory in video mode. I specifically need it for photography, not for video work. I also tried to update the firmware from 1.1.0 to 1.2.0 in video mode, but I ran into an error that halted the process. Now, the R5c no longer recognizes the ST-E10 in any mode. When I turn on the R5c in video mode, the ST-E10 blinks twice, which likely signals a failure or firmware mismatch. In photo mode, the R5c still does not acknowledge the ST-E10 at all. It's extremely frustrating that I can't use this accessory as intended in photo mode. I strongly urge Canon to address this issue in the next firmware update to enhance user experience.

Thank you for your time.

Re: Speedlite Transmitter ST-E10 and R5c Compatibility

deebatman316 — Fri, 03 Apr 2026 00:23:06 GMT

@thefunkmobile The EOS R5 C is NOT COMPATIBLE with multi function hot shoe flashes or transmitters. Look into the ST-E3-RT or older EX series speedlites.

Re: Speedlite Transmitter ST-E10 and R5c Compatibility

shadowsports — Fri, 03 Apr 2026 13:55:12 GMT

Greetings,

What my colleague @deebatman316 has mentioned is correct.

I see you've already found an older thread about this topic.

https://community.usa.canon.com/t5/Speedlite-Flashes/Speedlite-Transmitter-ST-E10-Compatibility/td-p/404422#M5923

Re: Speedlite Transmitter ST-E10 and R5c Compatibility

thefunkmobile — Fri, 03 Apr 2026 19:00:32 GMT

Thank you all! I just returned the ST-E10. It’s unfortunate that it’s not compatible but I already own the ST-E3-RT and was just hoping for something smaller.