This reminds me of my first SLR, a Canon EXEE that my dad gave to me. I only ever owned the 50mm, but there were 35mm, 95mm and 125mm interchangeable front lens elements. http://www.canon.com/camera-museum/camera/film/data/1966-1975/1969_exee.html?lang=us&categ=crn&page=1966-1975
Okotoks_Photos: Wow! Pentax has now doubled the number of lenses currently available for the 645D...
I live in Canada as well and you can purchase new Pentax 645 FA and DFA lenses through both Henry's and LL Lozeau, so they can be found new if you are willing to look for them.
The severity of this issue must depend on what sort of conditions you are shooting in. Fortunately I haven't encountered this problem after 6000+ exposures since purchasing the X10 in early November. I guess if orbs were ruining my photos I would be singing a different tune, but so far I have not seen any (in my own pictures, I have seen the examples online). So unlike some other early adopters I am still enjoying this camera and I have been more than satisfied with the image quality.