Question about Celestron AstroMaster 130EQ Telescope

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Obscured view through telescope

It appears that the focus mirror is being seen in the center of the view. We have focused a very bright star - but have a cross in the middle of it - and no it is not the Finder we are looking through, and it is not simply crosshairs. There is a specific obstruction. It is visible with both with the eyepiece and without.

Any idea what we could be seeing? And how to fix the issue? I've found the same problem as well - I'm using a Celestron Astromaster 130EQ Newtownian Reflector. I've had a look at a couple of stars and Venus and am getting very poor results- a cross in the middle of the viewfinder and very blurry and grainy image. Doesn't seem to matter what I do with the focus knob - the image just gets more or less blurry (what you'd expect) but the cross is still there.

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  • branty1970 Dec 26, 2008

    I've messed around and fiddled to try and find a fix and eventually everything started working properly. Not 100% sure what the problem was but this is what I tried:

    1. Tried another eyepiece - no difference.
    2. Tried pointing the scope straight up - better.
    3. Tried pointing the scope at a bright source again - not good.
    4. Left the camera pointing at the ground for a while.
    5. Tried again and everything started working properly - with both eyepieces.

    I think that the problem might have been some moisture on the eyepieces or the mirror. The scope had been left out for a while before I started observing to let the temperature equalize but when I was experiencing the problems the temperature was dropping like a stone.

    Oh well, experience now a little more than it was 2 hours ago.

  • lspe07 Dec 27, 2008

    I have the same problem with the same telescope.


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You can slow down dew forming on the mirror by NOT pointing the telescope toward the sky during cool-down-- just leave it parallel to the ground. Same goes for your eyepieces -- leave them covered, or inside a case.

Posted on Dec 28, 2008

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