BobGillette Posted February 13, 2021 Report Share Posted February 13, 2021 I've landed and operated an ASA N12 astrograph in rural New England (US) since 2008, in an area with very little air pollution. How do I know whether the mirrors need re-coating? Or should this be done just as a matter of principle after more than 10 years? Thanks, Bob Gillette Link to comment Share on other sites More sharing options...
MichiP Posted February 17, 2021 Report Share Posted February 17, 2021 Re-coating depends on the current quality. I have seen mirrors much older than 10 years and they are still in good conditions. Often mirrors are just dirty so a careful cleaning with alcohol and distilled water is enough to get a great result. It's hard to say anything about it without seeing the mirror. Could you show us a photo from your mirror? Michael Link to comment Share on other sites More sharing options...
-Amenophis- Posted August 30, 2021 Report Share Posted August 30, 2021 Be careful because I also wanted to re-coat my mirror because the quality was not there (for the price of the telescope I am a little disgusted with the policy of the ASA company). In short, I end up with a mirror from orionoptics with an aluminide sieve ... The companies contacted to re-coat the mirror all refused. The primary mirror being stuck on the barrel, the companies refuse to take charge of it (personal experience). Link to comment Share on other sites More sharing options...
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