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Re: Window Protection Or Not

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Posted by James Zdunic on April 5, 1999 01:33:04 UTC

I believe the original reasoning for a window was to prevent dust build up on the mirror surfaces. In my experience, if a cover is kept on the tube ends, and the focuser when the scope is not in use then dust is not usually a problem. I had a mirror for ten years and rinsing with deionized water a few times is all that was required until the coating started lifting. A simple recoat, and I 'm ready for another ten years. Also try not to use materials in the tube assembly which generate dust like felt, etc.

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