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  1. #1
    corpusse's Avatar
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    Default collimating SCT is it as easy as it sounds?



    I've been moving my OTA around a lot the last few days trying to get perfect balance. I think the collimation may be a bit off. I've been reading how to collimate an SCT and it seems pretty straight forward.

    Should I be able to do this without any tools other then a screwdriver? Vega should be a good star to start with. Any tips / suggestions.

    thanks
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  2. #2
    dmbryan's Avatar
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    Default

    This is a good read on SCT collimation
    name: Derek

    Various
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  4. #3
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    Default

    Thanks Derek.
    This is a great link.
    Declan.
    Celestron 8"Edge HD SCT.

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    Default

    No problem. Cheers.
    name: Derek

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    Default

    Yes Corpusse - collimating a SCT is pretty easy - and that link from Derek looks to be a VERY good resource.

    One thing though - If you don't have an artificial star, use Polaris rather than Vega.
    Reason being that Polaris remains almost stationary for long periods of time, whereas Vega will show significant sidereal movement over the time you are collimating - especially at the high magnifications required for the job.


    Also...
    If you intend to keep the scope for a long time, and can foresee yourself collimating it in the future - I can recommend 'Bobs-Knobs'
    http://www.bobsknobs.com/
    Available from most good astro-kit dealers (sorry but I can't recommend specific US dealers - I only know the UK market well)

    They replace the original collimating screws, and have heads which you can turn by hand - No need for tools, they make collimating MUCH more convenient.

    Here's the front of my C8 SCT, with 'Bob's Knobs' fitted to the secondary mirror.

    Last edited by Carlos_dfc; 06-30-2010 at 07:12 PM.
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  8. #6
    corpusse's Avatar
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    Default

    well it seems to have worked out. I'm not sure if its perfect but the stars look better and I was able to catch the great red spot this morning on jupiter.
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