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  1. #11
    Vinnie's Avatar
    Vinnie is offline Guest
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    Hi Panama

    First off you should now be able to post images/links.

    This will hopefully make it easier for you and us as well

    The system is in place to prevent automated spam and it is unfortunate but necessary and a policy which we will not change

    Re Tube Rings. These are not present on a Dobson Mounted scope

    Over tightened collimation screws refers to locking down the Primary Mirror screws too tight.

  2. #12
    rick rian's Avatar
    rick rian is offline Rianstein, the seeker of truth
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    Hi Panama and welcome aboard!

  3. #13
    Michael Steen's Avatar
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    Panama, tube ring clamps hold the optical tube assembly to an equatorial mount. If you have a dobsonian mount, you don't have them.
    Over-tightening collimation screws can distort the mirror. I know it took you forever to get the mirror into the tube, but if collimation doesn't work, no matter what you try, then the clamps holding the mirror to its support might be too tight. As a last resort, take the mirror assembly out of the tube again (put it on the floor with a pillow under it to catch it), and check to see if you can slip a business card between the clamp and the mirror. If not, then the clamps might be too tight. Loosen them just until the business card slips in, and then reinstall the mirror.
    As to a collimating tool, I find that, though it costs a little money, a laser collimator works great. The film can is very good for adjusting the primary mirror, but nothing beats the laser for adjusting the secondary. Putting the laser tool into the drawtube, you adjust the secondary mirror first until the laser dot is dead center in the primary. Then you go down and adjust the primary so the beam shines into the center of the target on the laser. At that point, you'll be 99.5% perfectly collimated, and you can happily stargaze.
    Good luck.
    Learning the sky--one star at a time.
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