Hi Enrique,
I live in a place very, very wet half of the year.
Never had problems with the EX-1.
The condensation out in the lens can be annoying, but I don't think much harmful.
Beware on the condensation you can get inside the lens when passing from a worm place to somewhere with air-con.
BTW, I think that must be some product to avoid the condensation.
rafael
http://www.nagavideo.com