Matthew Smith , Nov 07, 1999; 02:32 a.m.
Well, this doens't anwser your question at all, but Nikon has just announced a newer, CHEAPER, and apperently better ring light: the SB-29. pleas see:
You will find a lot of stuff on ringlights in the achieves. Some pros love them, others say they produce an unatural look. The SB-29 specificly may counter this and produce a more natural look by decreasing the output of one tube or the other so as to give natural, not-to-harsh-but-still-visable shadows.
It sounds, however, like you are succesful with your current setup. I doubt seriously if many (any) will look at your photos and say "boy, you really need an SB-21!"
John Shaw, for instance, does not use ring lights the last I heard.
Please do search the achieves for more info, you may be able to find a bundle of info. See also the nature forum for information.
I am interested in your 12x work, as I am currently attempting to doctument all the flora of america, and may need such power for photgraphing the distinguishing characteristics of seeds. Please contact me privatly if you have the time.
Good Luck to you,