Hi,
My friend and I got duped by a company called Camera Empire & Gallery in San Francisco in October 2004. We bought Wide angle lenses and Tele lenses. Wide angle lense work, but there's a huge black ring around the image that it's just no good using the converter. The Tele lense a Vision Optics Titanium 2.0x Digital doesn't do anything....Still, I'm quite sure that the lenses that we tried on in the store worked!?
The asian man that sold us all the products was mixing back and forth between the stuff, so he might have swapped the products before putting them in boxes and in the bag...
My advise is to avoid buying Crystal Optics and Vision Optics, atleast from stores in San Francisco!
Avoid this company:
Camera Empire & Galeria de Pars
789 Beach Street
San Francisco
CA 94109 by Ghiradelli Square
I'm currently stuck with one Vision Optics Titanium 2.0x Digital and one Crystal Optics Japan 0.45x AF High Definition Digital Lense With Macro.
We paid 542.50USD for two of each and two 52mm ring adapters for Fuji S7000 and two UV-filters from Bower.
Now I'm stuck here in Sweden with this crap. 
Now I use Hoya for my Minolta A2 and I'm very pleased with that.
Woth