Quote:
Originally Posted by astronut
John, Unfortunately the beginning of the end...the coating is failing.
Your images should still be ok for the moment, but this will get worse over time.
I would recommend that you clean the mirror, before further use.
John. 
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Thanks John, yes - definitely it needs a clean. This is from a Bintel dob that came with an Argo Navis that I bought from another IIS member on Saturday. Also this will be the first big mirror I will have cleaned.