can OCF settings be changed from body?

I believe [personal opinion] the lack of support for HSS with RT is the simple fact that HSS requires precise timing which cannot be guaranteed when using radio frequencies (knowing that there can certainly be environments which can be very saturated with other wireless signals which could potentially interfere). It was [LIkely] a lot easier to program this when using the optical system, where the speed of light is a constant.

drvnbysound wrote in post #15493363
HSS requires precise timing which cannot be guaranteed when using radio frequencies

Precise timing?
* Turn on the HSS pulse
* first shutter curtain
* second shutter curtain
* turn off the HSS pulse

coeng,

For about $90 a pair you can pick up a set of YN-622C wireless flash triggers detailed in this thread: https://photography-on-the.net …/showthread.php​?t=1212530

These radio triggers fully implement Canon's wireless external flash function settings directly from the on camera flash control menus of Canon cameras manufactured since 2005, including your 5D MkII. The only thing you need a 2012 camera body for is the new (and really great) Group mode that allows for control of up to 15 speedlites in 5 groups. These triggers will not support that but they will support the same 3 groups of off camera flash in either ETTL or Manual that have always been available before in the optical based Canon wireless system. They will allow you full remote control of both your 430EXII and your 600EX-RT. I have both, as well as a 580EXII, and use the 622 triggers (2 pair) to control all 3 from the camera menus without having to worry about line of sight communication. You just set the 600 in wireless mode not radio mode and it works just fine with the A:B C groups. Lots of 2.4Ghz radio goodness for not much cash. Oh and they fully support HSS as long as the flash itself does.

This would give you a lot of radio functionality without having to purchase a new camera or more 600EX's or an ST-E3. Even if you decide to spend all the money to go the full Canon 600 radio route later you wouldn't have spent hardly anything to get camera menu control of OCF in the mean time. Just an alternative to consider.

Dave