This link might help.
Small flash style accessories really do lack the power to do very much, though they can be fun. One thing they are very good for is controlling contrast by filling shadows on axis, once you have done the narrow dof thing then that really is their best use.
Here is an example of the narrow dof on axis "look", done with one of the cheap $200 options (I forget which!).
Again, thank you.
I looked at the link and the links from there, among the video.
Hmmm... I love the look you have on this shot. The other ones posted further down are great too, but I see that they cast shaddows (not that that in itself is wrong when going for that).. Why would one use a ring flach instead of a beaty dish (in studio). My impression is that you can get the same effect with a deep beauty dish, but also because of the deepness and the curve of it eliminates the shaddows behind the subject much more? Or are these really two different things for different looks? Is the main benefit of the ringflash that you can have the lens through the light, thus giving other angles of light?
Please forgive me my ignorance.