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I generally put a light down the barrel and look from the pack for scratches and too many pin holes. I read about this in a few places. I also look for wear at the edges on the reflective side, like pitting or flaking. Or a poorly finished edge in manufacturing. All things I have read about. I didn’t know if anything else was worth while or if it made a difference at the eyepiece. Hand made mirrors should be more than ok I would have thought, just not sure about mass produced glass such as Meade or skywatcher etc.
I have read that the surface of a mirror is generally good for 10 years, then it should be resurfaced. I would have thought that this is dependent on amount of use and storage of the scope. Any thoughts on that?
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