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Thread: Cleaning

  1. #1
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    Default Cleaning



    My 2yo son and I were looking at the stars the other night and he thought he could pick it up off the secondary mirror , i have a 10'' skywatcher dob what is the best ( and safe ) way to clean the secondary mirror
    10'' sw dob , homemade denver observation chair , various eye peices , nixon coolpic l3 (afocal)
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    Default

    Whew. I hope you gave him a star for him to keep in his pocket (you can only see it late at night, so keep it safe until then !!)


    I hope you haven't started yet. Please read the information at the Arkansas Sky Observatory website, DrClay has a list of instructions and a proven formula for a cleaning solution. But...cleaning the primary mirror is not recommended unless it is really really needed. Perhaps you can " spot clean" the fingerprints off using Clay's formula without taking the chance of damaging the whole mirror. Small spots won't hurt your final image noticeably, but if you haze the mirror or make a scratch pattern by scrubbing...that will.

    Sounds like a good accessory would be a "shroud" for the lower part of the scope. This will also likely increase your observing contrast, in addition to keeping the stars on the mirror where they belong !!

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  4. #3
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    Default

    Good advice above. By the way the MIRROR at the McDonald Observatory has a BULLET HOLE in it, and still works just fine! Ha!

    Read this:

    Cleaning Optics

    and you should probably NOT clean anything just yet.
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    Quote Originally Posted by Joe Lalumia View Post
    Good advice above. By the way the MIRROR at the McDonald Observatory has a BULLET HOLE in it, and still works just fine! Ha!
    Really? The bullet just put a hole in it without cracking it?

    BTW, etool son's touched the secondary mirror. Don't know if that makes any difference in the advice.
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    Default

    Yes, here is the article:
    Bill Keel's Telescope Tourism - McDonald Observatory

    Doubtful that your son's touching the secondary will be visible in the eyepiece. You will need to remove the spider holding the secondary in order to clean it. The scope will need to be collimated once it is put back together--- if you decide to do this.
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    Quote Originally Posted by Joe Lalumia View Post
    From the article: "the 107-inch telescope ... is now the equivalent of a 106-inch telescope."
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    Default

    Oh, the secondary mirror, yes I see that now....that's not too bad, but it means the fingerprint covers a larger area, and the same cautions still apply, because it's a "first surface" mirror and the coating is easy to damage.

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    WO Multiple Reticle Red Dot finder, Celestron SkyMaster 8x56 binos
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