I should have said, I'd be using it for Macro shots, would this mean I'd need less light output?For Macro or for portraits?
There's loads of DIY examples online, I've been tempted to make one a few times, a big MDF circle with a chain of bulbs daisy chained around it and just plugged in.
No trigger like a flash...it would be a continuous light
I have a few links on how to do this at home - They range from 2 tupperware bowls, cardboard and aluminium foil. right up to using bundles of fibre optic threads bunched together at the flash end and spread out over the ring.
I can't access these at work to check if they are any good (or the ones I have seen at home) but they these:
http://www.google.co.uk/url?q=http://www.flickr.com/groups/strobist/discuss/72157603455708647/&sa=U&ei=E4GMTbWlNNOzhAfW8cC2Cw&ved=0CBMQFjAC&usg=AFQjCNF9IkpHi2JydFJD9T1fEuPYY2pthg
http://www.google.co.uk/url?q=http://strobist.blogspot.com/2006/09/super-cheap-diy-ring-flash.html&sa=U&ei=E4GMTbWlNNOzhAfW8cC2Cw&ved=0CA8QFjAA&usg=AFQjCNHhkdU4dgcp7RSvYuDrQOv_JWdyZQ
Nice links, thanks. I quite like the way they incorporated an existing flash. I'll so some more searches on google, I'm looking to make something that doesn't need an existing flash ideally, because I don't actually own a flash!

This isn't meant to be cheeky or sound that way but I can't think of how to phrase it any other way - How are you thinking of lighting the ring flash then?
A ring of LEDs around the lens powered by batteries! easy!
Ahhh...yes but to CAPTAIN PEDANTIC (duh duh dahhhhhh!!!) that's a ring light - not a ring flash. Small but subtle difference in words and BIG difference in light output both in terms or light quality (temp) and intensity.
Good luck with it whatever you decide OP

think im going to look into this myself may post a build thread on here.should be interesting,ideally i would like to power mine from the flash hot-shoe. i will have a think about some designs and post some ideas as all the ones on the net seem very crude and basic.![]()
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