Thu Nov 29, 2007 1:46 am
First let me note that it's been years since I did a lot of work with multiple flash units, and in those days they were strictly manual. So, it was the only way to get decent exposures.
But today, if you're using automatic flashes it's not as difficult since the flash automatically reads, and adjusts exposure. Since I'm not specifically using the mentioned flashes, maybe someone else could advise you better. But if they're automatic, hopefully they'll have adjustments for output so you can vary their balance.
As far as how important it is to get a good exposure shooting RAW, I'm of the old belief that you should get the exposure right, regardless. If you underexpose RAW, it still adds noise from my personal experience. While it does give some latitude, it's never good to become lazy and think you can fix it later.