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Re: HELP!!! I Need A New Secondary Mirror. What Size?

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Posted by Robert May on May 9, 1999 21:59:39 UTC

: I have ruined the surface of my secondary mirror while cleaning it. How badly have you ruined it? Scratching the Al. surface is easy to fix. Just costs some money to send it to a coating firm. They all will charge you some money to remove the Al. coat and then recoat it for you. It will probably cost a fair bit less than getting a new secondary. The size of a secondary depends upon what you are doing and how much vignetting at the edge of the field you want to accept. Either of the secondaries will work just fine and the smaller one is probably just the manufacturing error (how far off in the tolerance of making the glass piece is from what it should be) off from what you have now.

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