Century Optics Wide angle adapter 37mm for HF10 etc.
 

I have been successfully using this adapter to acheive wide angle with a very compact form factor. I'm not sure if this is the right place to put this, but I have to get rid of my HF10 and will sell this for a reasonable price.

Are links allowed in this forum? If so:
Century Optics.55x Wide Angle Adapter 27 30 37mm mm Cam - eBay (item 220431135606 end time Jun-15-09 20:35:02 PDT)