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) (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=220431135606)