EOS M and 600EX-RT

I've read a lot on the 600EX-RT's and I'm wanting to switch, but want to figure some things out first. Right now I have 580EX's and Pocket Wizards.

1) Sync speed. This only matters when it's off camera right? As in, with any camera (pre-2012 included), when it's on camera the factory sync speed always works like normal, right? When it's in radio wireless, it's 1-stop less than normal? Can anyone verify this with the EOS-M or not? What about optical wireless... do you still take a hit with sync speed?

I'm not looking for things read on the internet. I'm looking for someone to put a 600EX-RT on their camera and test sync speed (5D2 and EOS M), and to put a 600EX-RT off camera and trigger it with a ST-E3RT and see what you can get for sync speed with those same cameras. Please also list how you tested and what settings you got out of it.

2) No groups with 5D2, right? What 'bout EOS-M? Again, actual hands-on tests only folks.

Thanks and looking forward to the results!

Just had a EOS M recently, took some test with 600 and ST-E3RT This is what I can answer so far. All the features of the 600EX-RT and ST-E3RT that work on my 5DMKIII work for ESO M, including group mode. Hope this help.

Awesome, thanks bizzle! I did just find this site and it's awesome... http://cpn.canon-europe.com …e_flash_system_​for_eos.do

The EOS M is fully in the 2012+ camera lineup so it DOES include all features... awesome! Now I've just gotta figure more about the 5D Mark II.

5DII will work with most 600EX-RT features in radio wireless. It will NOT work with Gr mode.
Think of the 600EX-RT as a 580EXII with wireless radio communications when its on a 5DII.

Thanks dmward, any word on radio wireless sync speed on the 5D2?

gtrag94 wrote in post #16206183
Thanks dmward, any word on radio wireless sync speed on the 5D2?

I never had a problem with the firing remotes at 1/200. And it also worked in HSS mode.
I know the manual says otherwise. I got my first 600s while I still had 5DIIs based on a video that Syl Arena did while beta testing the 600s with his 5DIIs.

Sometimes the indicators on the flash unit suggested it didn't like the setup but it still fired and did what is was supposed to do. 600EX-RT is basically a 580EXII with radio on a 5DII.