Since (apparently) everyone read strobist, this probably isnt news for most people. But you know, if you havent seen this and are thinking about buying a ringflash, you should see it.
(as some of you may or may not know, I pretty recently bought a ringflash and a portable powerpack)
Heres the link to the strobist post; with a video by John Richard testing a Profoto Ringflash and a SB800 + a rayflash adapter.
Its rather intresting to see how close the rayflash look is to the “real thing”, but atleast for me, who happens to not own a nikon d3 or a 5d mk ii wich takes good pictures at 2500ISO (wich you had to use for a fullfigure shot on the rayflash @ 80mm). Im really glad I didnt get a simple adapter (I was actually looking for the rayflash thingy in Norway, but couldnt find anyone selling it).
The pros of the pro flash seems pretty crucial; it can take images on F11 without problem (I also have no problem on higher Fs like, F18 if I need that to overrun the sun), the flash has more movability (it can be very important).
For instance here;
I flipped the ringflash a bit to get a better light on him, and not to much down on the ground.
And ofcourse – as he mentions in the video to; you dont have to wait about 7 years between each shot (really, if you’ve shoot with me, you know I shoot ALOT, and I shoot fast:P).
Also I also use strong strobes in studio, so a rayflash wouldnt be very usuable for the beauty work I envision using it for.. =D