I'm a total ignoramus when it comes to arranged lighting as I've always worked with available light. I'm also very new to portrait photography. Although I have no plans to get studio time in the foreseeable future I have started thinking of investing in a ring flash unit.
I'm a big fan of the classic, dramatic Hollywood look on facials but I'm doubtful anything like this could be achieved without strictly controlled lighting. I see lots of beautiful celebrity posed portraits shot outside the studio with the tell-tale circular reflection on eyeballs. While I'm sure there are reflectors galore outside the frame, would a ring flash be useful outside the studio in general?
As I've never owned an external flash, what are the things I should consider in buying a ring flash? Are they compatible with different cameras or lenses (I'd be using it with the Canon 30D with a 85mm EF f/1.8)? Is the relatively long "actual" focal length of ~135mm a limiting factor with the power of the flash or should I get a 50mm lens for portraits? Is there a good reason to avoid the cheaper units? I will get the most expensive one I need as I'm poor - this means I can't afford to replace a cheap one with a more expensive one if it doesn't do it's job.
And perhaps most importantly, do you think a ring flash would be a good investment for an intermediate serious amateur getting into portrait photography? I have seven years of experience with SLRs and consider myself technically competent outside portraiture.
Thanks a lot for help!
PS. I'm not going to do any macro work with it.



