Quote Originally Posted by HDNitehawk View Post
The 580ex is going to give you more reach than the 430ex. Are you that far away that the 580ex wouldn't be effective? The better beamer will give you more reach, but in most situations that come to mind for an indoor auditorium I would not use it. The big lens draws enough attention on its on without adding the beamer to it. But to each his own on this one.
Yes, the 580 would give more reach. The problem is that when pointing the flash directly, the typical hard light cast shows up, and I also get a lot of red-eye, because I'm using a long lens.

I'm sure it would draw attention, but from a strictly performance point of view, would the beamer give a better light with little or no red-eye?

I assume you're using a Beamer? Does it do what I'm looking for?