Hi Mick!
i have my C14 outside under 2 layers of canvas since 2003.
The scope is removed only once a year for a few weeks when i go on vacation to the islands...
I cant see any problem on it.
Thats the way how it looks like "uncovered" (last image on the page):
http://www.werbeagentur.org/oldwexi/pier.html
Thats how it looked like "covered" in summer of last year after a heavy hail:
http://www.werbeagentur.org/oldwexi/...anvas_hail.jpg
And the latest results a few days ago with the scope out since 5 years:
http://www.werbeagentur.org/oldwexi/...y_deepsky.html
I dont see any need to worry. These things are built to be used
under different extreme temperatures and in dry and wet conditions!