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.
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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? – Romeo Ninov Apr 18 '15 at 14:12
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@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
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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
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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.
inkista
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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 – Romeo Ninov Apr 19 '15 at 01:27
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Optical is wireless, but it isn't wireless RF (radio frequency) which is how the 600EX-RT communicates. – Michael C Apr 19 '15 at 02:23
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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 02:58
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As stated above this article http://www.learn.usa.canon.com/resources/articles/2013/remote_camera_firing_speedlite600exrt.htmlp 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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@Fred, just make sure you note the bit in that article that goes: "...if you have one compatible EOS camera with [a 600EX-RT or ST-E3-RT] mounted, you can take another 600EX-RT “slave unit” off-camera and fire the camera by pressing a single button on the flash in your hand." I.e., your popup flash can't be used for this. – inkista Apr 20 '15 at 18:00
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I ordered an ST-E3-RT which came today so have been able to check out the function together with a 600EX-RT Speedlite Flash. Have been trying to get them to function for the past 2 hrs and purely by some freak stroke of luck finally had success. Once I have figured out tomorrow what the exact settings were required I will post back. – Fred Apr 21 '15 at 19:54