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Thread: Collimation Issue

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    Default Collimation Issue



    I'm collimating my XT-8 and having some issues. I'm thinking I have something not tighten down properly, I colimate the telescope angled horizontally, and everything looks great. The issue is when I move the telescope, angled 45* up and it begins to fall out of collimation, place the scope vertically and it's even further out of sync, then I move it back down to horizontal and its right back to where it should be. What am I doing wrong?

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    Default Re: Collimation Issue

    Could be any one of a dozen things. You have to chase them down 1 x 1. Some are easy.

    Is it the focuser moving? Easy to tell just push it gently it will probably move a little but return to its original position.

    Is it the diagonal? Again reach in there and nudge it a bit.

    Could be 'mirror flop'. I had some in my astrograph (same mirror cell as the xt8) and I solved it by putting little dabs of silicone on the sides of the mirror.

    Someone will be along shortly with more ... specific help I hope.
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    Default Re: Collimation Issue

    Check the secondary vanes..and the secondary collimation screws...something is loose.
    same goes for the primary. lock it down snug...

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    Default Re: Collimation Issue

    Carefull now tighten the primary adjustment screws down snug. Not the clips that hold the mirror Just wanted to clairify.
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    Default Re: Collimation Issue

    Quote Originally Posted by UlteriorModem View Post
    Carefull now tighten the primary adjustment screws down snug. Not the clips that hold the mirror Just wanted to clairify.
    The collimation holds great, but what's up with all this astigmatism?

    Ya... the primary mirror retaining clips should not be tight. "almost" touching the mirror is more like it for those puppies...

    No newbie would ever think of removing the mirror and cell on a new scope anyways...oh wait....Yes I did.....to check and loosen those clips, and just because I could....It took a whole 5 minutes...

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