Sp00ks wrote in post #5487768
That is the only thing I have used mine for and it made the difference in keepers vs. non-keepers in my scenario. The birds aren't crazy about it, they usually jump pretty good when it goes off.

Yeah, birds will be the predominate use of mine. It's a little problematic though, because for birds in flight I "need" high shutter speed because the ambient light is high when I need to fight extreme backlighting. The cameras max sync with flash is 1/250th so it nullifies high shutter speeds and blurs the shots due to lots of ambient light.
What I'm about to try is the High speed sync feature on my Canon flash, but it reduces the effective distance of the light dramatically. I haven't tried it yet though and it may be that with the Better Beamer on there, this might be able to compensate for it well enough. I really want as a minimum to be able to make a catch light in the eyes and of almost equal importance I'd like to properly expose the underside of the bird against the sky. It could be that I'll get enough to enhance the detail to acceptable levels though and make a compromise. The third issue is the flash can't recharge fast enough for many shots per pass (BIF I'm talking about here), but all that may be okay with high speed sync. I just have to give that a go. With stationary or slow moving birds (swimming ducks) there is no real motion problem without HSS, however there may be a reflection problem off the water onto the duck.
Some birds react differently to the flash than others. Some swimming ducks have had a physical reaction to each flash that looks like you smacked them in the head. They keep swimming around though. Other birds don't even notice it it seems like. I've shot tree trunks where I thought an owl might be hanging out and I'd check my screen after I shot the pic. The dark spots of the tree exposed beautifully at long distances so the bird would have been fine. When I've shot elk with it (even in complete darkness) they didn't even budge (manually focused). I haven't shot enough of them to be an expert, but I shot a herd with it, when I was testing and it didn't bother them. No keepers though, I was testing to see what I could pull off. I keep wondering if I'd stir up a reaction if I'd flash a bear with it. They could really use the light (black bears) to get a good exposure.
White eye in animals has been a problem when it's the primary light and to a slightly lesser extent when it's fill light. I'll probably try a light stand and umbrella with remote triggers sometime to see what is possible without white eye one of these days.