Yeah man, the specular highlights come totally from a bare bulb for me, be it a cfl bulb close to focus with of a ring/speedlight. I really like the studio lights brightly lit look but it does get a little old if it's your only option. Anything shiny like beetles or the neck/back of the creos seem the hardest to control for me. It's what impressed me most about Igor's now famous Mantis and insect pics, he controlled the real well and still got an excellent exposure.
I agree on the canon glass although I'm not against anything else, that Nikon multi macro flash thing is beyond sick. The only reason I chose Canon was the ridiculous MPE-65m lens, nothing gets you that close with as much DOF and as much light unless it's a microscope and it's really hard to hand hold them. :blink: Plus changing magnifications is a quick twist, yum.
I thought the same about a ring flash too but it lasted about 2 days as every shot looked so damn flat, I much prefer a flash off the camera's axis. I have the cheap Delta, a cheapy knock off of the cheap Marumi one, lol
http://cgi.ebay.co.uk/Macro-Ring-Flash-Delta-DRF-14-C-CANON-450D-1000D-5D-/350361541126?pt=UK_CamerasPhoto_CameraAccessories_CameraFlashUnits_JN&hash=item51932cda06
Check out these forum pages/galleries for some simply stunning macro shots, nearly all of the ones that appeal to me are never just ringflash, usually an off camera speedlite.
http://photomacrography.net/forum/viewforum.php?f=26&sid=b442105e7788a82cdf0a42c9b925ae04 (for nature macro)
http://photomacrography.net/forum/viewforum.php?f=27&sid=b442105e7788a82cdf0a42c9b925ae04 (for studio macro and beyond)
It's ok for the money I guess but you can't turn half off and it's not a full circle. It's only TTL (No manual power settings) which doesn't work for magnifications below 1:1 too well but the flash compensation on the camera gives you a couple of stops to play with. I use it with half covered and at higher magnifications and another slave that the ring flash sets off. I know you can spend less and get 3 to 4 times more power and loads of flexibility.
My tubes were also cheap ones that didn't let you change aperture or metering or talk to the lens at all, like these:
http://cgi.ebay.co.uk/UK-Macro-Extension-Tube-Ring-4-CANON-EOS-EF-DSLR-SLR-/220679082738?pt=UK_Photography_CameraLenses_Lens_caps_hoods_adaptors_ET&hash=item33617f92f2
I did get a bit or reflection inside these when not using a lens hood but some black felt sorted that out, I just didn't trust the monkey metal with a lens, and hated using both tubes as there was just so much movement when stacked.
Then after about 8 months of not being able to change aperture without removing the lens while holding the little DOF preview button got too me and I bought the Kenko ones. It was gutting to have to pay that much for such a simple bit of kit when 200 quid could have gone towards shiny new glass. They do however work perfectly and I don't regret it at all.
kenko link:
http://cgi.ebay.co.uk/Kenko-Teleplus-Extension-Tube-DG-Set-Canon-EF-EF-S-/170591317740?pt=UK_CamerasPhoto_CameraAccessories_CameraLensesFilters_JN&hash=item27b808eeec