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    stepintoliquid's Avatar
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    Default Collimation question....



    alright, so i've spent the better part of two hours collimating my 130mm newt.

    i (believe) i have the secondary mirror centered under the focuser, the primary mirror's reflection centered in the secondary mirror, and the secondary's reflection in the center of the primary's reflection.

    but, i was wondering about the reflection of the collimating tube in the very center of everything.... it seems to be off center slightly in the secondary's reflection. is this normal, inconsequential, or is there something i can do to correct this? thanks guys!

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    Offroader's Avatar
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    Default

    After becoming frustrated trying to collimate my Astromaster 130 with a Cheshire collimating eyepiece, I purchased an orion laser collimator.

    After collimating with the laser, I realized how out of collimation both mirrors were.

    When I looked at the Orion Nebula and Saturn, I saw neat images I had never seen through this telescope. I felt like I had just purchased a more expensive telescope.

    I collimate before each use, and the laser collimator allows me to see that the telescope gets out of collimation just by moving it.

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  5. #3
    TambourineMan's Avatar
    TambourineMan is offline Stressed Out
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    Default

    Before rushing to buy an Orion lasermate, you may want to read the following threads as there have been reports that some of them are not properly aligned. I am happy to hear that offroad gets good results.

    Orion LaserMate Collimator- Recommendations - Astronomy Forum

    Telescope Reviews: New Orion LaserMate Deluxe

    Telescope Reviews: Communication with Orion on Lasermate Deluxe

    For lining up the primary and secondary you are much better off using a sight tube. Also you may be better off using the barlowed laser technique.

    I am not sure what you mean by the reflection of the colliammting tube being off center. Can you provide a picture?

    Here are some good links to collimation:

    Andy's video is one of the best:
    How to Collimate the Orion XT10

    But try these websites also:

    Astro Babys Guide to Collimation
    Astro Babys Guide to Collimation

    Here is one written by Tom Clark who is a member of this forum, author of "The Modern Dobsonian," and maker of over 200 telescopes under the Tectron name:
    Collimation

    Describes how to collimate and make your own tools
    FAQ about Collimating a Newtonian telescope

    The barlowed laser technique:
    Rear View Barlowed Laser Method

    Sky & Telescope magazine's excellent and professional instructions:
    SkyandTelescope.com - Do It Yourself - How To Collimate Your Newtonian Reflector

    Good overview off all techniques:
    Collimation

    Another writeup:
    Collimating my "Dob"

    Here are some threads by others here that were also having trouble collimating Orion XT10's which include some pictures and diagrams:

    Collimation frustration
    Seek advice on Collimation of XT10

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    Offroader's Avatar
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    Default

    Quote Originally Posted by TambourineMan View Post
    Before rushing to buy an Orion lasermate, you may want to read the following threads as there have been reports that some of them are not properly aligned. I am happy to hear that offroad gets good results.
    If you check the dates on those reviews, they are from 2007, and they refer to the first generation of Orion's Lasermate.

    I haven't heard a single complaint about the newer ones, like the one I own.

    And I have confirmed my telescope has been perfectly collimated by doing the out-of-focus star test, where the concentric circles appear perfectly centered.

 

 

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