So I can place my ST-E3-RT (as a master) on the 1DX or 5DIII and trigger the camera from the remote 600EX-RT set up as a slave. Then using menu2 to bring up the REL and trigger it all.
Now is there anyway to reverse the process and use the flash as a master at the camera and trigger the camera from a ST-E3-RT held in my hand?
Also currently if I want to use my Sekonic 758DR with the Canon 600EX-RT flashes and ST-E3-RT I ended up getting a Pocket wizard to trigger the camera, which, triggers the flashes. It works great but using two radio systems is a little bit of a pain and pretty expensive. Anyone got any better ideas here as well.