I've been really wrestling with the issues of proper use of on-camera flash light, 580EX, particularly the proper light output to the subject distance in situations where ceiling bouncing is out of the question.
I'm getting more and more requests for such shoots, and the one event that I just completed had a very unsatisfactory results (although the parents apparently liked them very much, or so they say politely!). The following casual and snap shots were just practice (while my boys were practicing their own stuff!), to simulate the actual situation that I'd often find myself in. These were frontal shoots with the flash set vertically onto my diffuser-reflector (like LumiQuest's pocket bounce) that redirects the light about 90% forward.
What I'd like to learn is whether I'm doing the "right" thing in terms of proper exposure that makes the subject look "natural" without too much hint of "flash." Also, I seem to have better results with the flash set to "M." When I use "E-TTL" mode, like the recent event, I got a lot of blown images. I'm pretty sure that's not the "E-TTL" fault but entirely mine, but I'd like to get your opinions as to why that is if you don't mind...
1)
SS 1/250
Aperture 4.5
FL 34mm
2)
ISO 100
SS 1/200
Aperture 4.5
FL 70mm

I'm waiting more of yours, by the way.
