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Mirror Quality And Recoating

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Posted by Rick Crockett on October 3, 2000 17:05:19 UTC

Hi Bob,

Probably the mirror is good quality. Don`t make decisions on the name though, rather test the mirror. Good names sometimes come with bad optics and to a lesser extend the opposite can be true. Other environmental considerations may affect changes in mirror quality. If you feel unqualified to determine quality try to find another or two that can. Or simply, are you happy with the views you get. Try it out on the moon, is it sharp with different eyepieces? Then again on some double stars. If you find you are happy with the views then you should do no more than recoat and maybe not even that. I have seen awful looking coatings give excellent results. A way to check what you are losing is to hold the mirror up to the light. It is common to see some light and pin-holes through the backside but if you can read a newspaper through the coating, you can be sure it is time for a recoat.

Good Luck,
-Rick

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