does the wide angle adapter have a filter thread on the front of the lens?

how would you go about filtering this lens for protection (uv/clear)?

do you guys recommend using a filter for protection on your gl2? what brands do you guys like: tiffen, b+w, canon, heliopan?

mb4

All those UV filters are good. Heliopan and B+W are the same company. Just go for any UV.

I don't know if that adaptor has threads. I don't think it does (but I could be wrong).

Nope, no threads on my WD-58