Check out the review here... http://pixsylated.com/blog/canon-600ex-rt-first-impressions/
Some observations from the review....
1. High Speed Sync supported for 1D X and 5D3 (but also worked on the reviewers 5D2 all the way to 1/8000sec)
2. Tested to a Range of 100m (340') worked flawlessly in an open field (Canon's Spec claims 30m/98')
3. There will be a non radio 600EX for countries that haven't adopted the 2.4gHz for unlicensed devices.
Cheers,
Wrathwilde
Some observations from the review....
1. High Speed Sync supported for 1D X and 5D3 (but also worked on the reviewers 5D2 all the way to 1/8000sec)
2. Tested to a Range of 100m (340') worked flawlessly in an open field (Canon's Spec claims 30m/98')
3. There will be a non radio 600EX for countries that haven't adopted the 2.4gHz for unlicensed devices.
Cheers,
Wrathwilde