Hi is it possible to remotely trigger an EOS 70D using a 600EX-RT? For example, I'd like the EOS onboard flash to be the slave and the 600EX-RT to be the master.

  • Hm, this sound very odd for me. Camera (and internal flash) should be master as camera shoot, not flash. Do you have special reason to want it? Apr 18 '15 at 14:12
  • @RomeoNinov this is a feature of the Canon RT flash protocol: a signal can be sent to one or more (2012-or-later) Canon camera's hotshoe(s) to trigger the shutter(s). See: Remote camera firing with the Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT
    – inkista
    Apr 18 '15 at 17:16
  • Wow the link to the article (See above) by Rudy Winston seems to answer the question. To all you Guys a big thank you.
    – Fred
    Apr 19 '15 at 16:53

No, you have to have another RT unit on the camera hotshoe to use the remote shutter release capability of Canon's 2012-and-later cameras. The built-in flash cannot work for this, as it has no RF capability--only optical (i.e., it blinks out light signals, but can't blip out/receive radio signals).

It might be easier to just get cheap radio triggers to be your shutter release, or a Yongnuo YN-E3-RT/YN-600EX-RT.

  • As far as I remember 70D can be wireless (not optical) master. Unfortunately at the moment I can't fine the page in documentation where i read this Apr 19 '15 at 1:27
  • Page 200 in the manual Apr 19 '15 at 1:54
  • Optical is wireless, but it isn't wireless RF (radio frequency) which is how the 600EX-RT communicates.
    – Michael C
    Apr 19 '15 at 2:23
  • 1
    @RomeoNinov All Page 200 says is that the 70D can do wireless flash, either radio or optical--easy to mistake that for meaning the 70D's built-in flash. Canon's documentation on using wireless flash doesn't help. But the pop-up flashes in all the camera bodies are optical masters for wireless (communication is done via flash bursts). I covered some of the Canon optical vs. RT wireless flash differences in this answer.
    – inkista
    Apr 19 '15 at 2:58
  • As stated above this article learn.usa.canon.com/resources/articles/2013/… seems to answer the question. I just need to put it to the test.
    – Fred
    Apr 19 '15 at 16:55

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