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| p.1 #11 · Control slave strength wireless on 600EX? |
...Would I be able to select group thru the camera menu LCD?
Yes; you set the group on the flash itself, and then once set you can select and control the group from the master via either the on-Speedlite menu or the on-camera menu.
The on-camera menu will change depending on mode. For example, in ETTL mode you'll be offered a choice of ratios, and in manual mode (which I often use for formal portraits) you'll be offered a choice of power levels for each group; 1/1 (Full power) 1/2, 1/4, etc. in 1/2 or 1/3 stop increments depending on set-up.