|
I used to find that I could rotate my newt (GEM mount) upside down, so the mirror is up. I used to cover the secondary with a cloth bag that came with a fishing reel. This helped quite a bit.
My refractor always has the lens caps on when not in use, the objective cap has dessicant bags taped to the inside (so I can peel them off and re dry them in a warm oven every so often).
Probably the best (but most expensive)for an observatory would be to have a smallish fan with a very good filter drawing filtered air into the Ob 24/7. This way there is always a slight but positive air pressure inside the Ob that naturally will keep dusty air out.
|