B Cuddihee 1968 Jason Empire 60X700mm refractor 1977 Jason Empire 313 discoveror EQ Celestron Nexstar8SE "The Bumblebee", with Feathertouch Microfocuser, and Celestron CPC Heavy Duty Tripod. Stellarvue 50mm "Sparrowhawk" finder Denk bino's with Power x switch. Pair of Edmund 28 plossls. Pair of Edmund 28 RKE'S Pair of 24mm Brandons. Pair of Smart Astronomy 19 EF's. Pair of 18mm Celestron Ultimas
I only know, i know nothing.
Quote:After 15 months, my EdgeHD 8" developed a very strong hazing on the correector (and maybe the secondary as well but I could not see it) and I am positive that it was some kind of outgassing.So, I get it. Closed tube does not protect you from outgassing and in fact, traps the gas until it can condense.Happy to hear it went well.Modern SCT mirrors are all coated with very hard Silicone Dioxide. This material is harder than the glass below the aluminum coating and with reasonable care there shoud be no worries about cleaning it.More importantly is that if the rear cell was removed, that the tube was not tilted with respect to the optical axis when it was re-assembled. This will give a decentering of the secondary. Make sure you check for this if you dropped the rear cell.