Update: it's actually very easy to use with a hotshoe flash: put both on a stock umbrella mount and slide the flash and mount right inside the umbrella through the opening in the white diffusion fabric. Set the flash on wide. I flipped-down the fresnel diffuser on my Pentax AF540 as well.
Light on the left is a Fotodiox 24" folding softbox with the front diffuser off, acting similar to a beauty dish; ie: more specular than normal. Pentax AF540 inside.
Background is a 42" 5-in-1 reflector set to The Dark Side. Lights triggered by Cowboy Studios wireless triggers.
Model/MUAH: Louise Peacock
Photo/Retouch: Bruce Walker - Model Mayhem # 1440574
Studio: The Family Room :-)