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  1. #1
    william.lugg@cisf.af.mil's Avatar
    william.lugg@cisf.af.mil Guest

    Default Single Axis vs. Dual Axis drives



    We're looking at buying a telescope for our 13 year old son and are
    looking at drives. What are the pros and cons of the single and dual
    axis drives? What can you do with one that you can't with the other?
    We're looking at the EQ-3M drives from Orion.

    All thoughts are welcome.
    Bill Lugg


  2. #2
    David Nakamoto's Avatar
    David Nakamoto Guest

    Default Single Axis vs. Dual Axis drives

    In my opinion, having used both, if you're only going to do visual, you only
    need the single axis drive. It drives the RA, alleviating the necessity of
    continuously adjusting the RA to track objects.

    The only purpose for a dual axis drive is for high mag web camera imaging of
    planets, which means a large telescope. Don't waste your money if you're not
    going this route is my advice.

    Good Luck !
    --- Dave
    --
    ----------------------------------------------------------------------
    Pinprick holes in a colorless sky
    Let inspired figures of light pass by
    The Mighty Light of ten thousand suns
    Challenges infinity, and is soon gone

    david.nakamoto@verizon.net


    <william.lugg@cisf.af.mil> wrote in message
    news:1132987473.794440.131580@o13g2000cwo.googlegr oups.com...



  3. #3
    Chris L Peterson's Avatar
    Chris L Peterson Guest

    Default Single Axis vs. Dual Axis drives

    On Sat, 26 Nov 2005 09:43:53 GMT, "David Nakamoto"
    <res07oeg@verizon.net> wrote:


    I'd say the need for a dual axis drive is for longer exposure imaging,
    where you need to compensate for declination drift. When I'm imaging
    with a webcam, I turn off the declination correction completely- there
    simply isn't enough declination movement in a fraction of a second to
    matter. Sudden movement from rough gears is more likely to be a problem
    than any natural drift.

    _________________________________________________

    Chris L Peterson
    Cloudbait Observatory
    http://www.cloudbait.com

  4. #4
    David Nakamoto's Avatar
    David Nakamoto Guest

    Default Single Axis vs. Dual Axis drives

    I find that manual knobs are harder to use to re-center images than a dual drive
    design. And yes, I've done it both ways. I agree that you can't use the Dec
    motor to correct for drift while webcam imaging.

    And the dual drive design he's referring to does not allow for autotracking for
    imagers doing long exposures, so that isn't a good reason to get it. This is
    just a paddle operated manual dual axis drive for the EQ-3 and similar mounts.

    --- Dave
    --
    ----------------------------------------------------------------------
    Pinprick holes in a colorless sky
    Let inspired figures of light pass by
    The Mighty Light of ten thousand suns
    Challenges infinity, and is soon gone

    david.nakamoto@verizon.net


    "Chris L Peterson" <clp@alumni.caltech.edu> wrote in message
    news:ad0ho1lhc74sq5b4p0fhb27tdqbgshvi63@4ax.com...



  5. #5
    Stephen Paul's Avatar
    Stephen Paul Guest

    Default Single Axis vs. Dual Axis drives

    But you can manually guide with the dual.

    "David Nakamoto" <res07oeg@verizon.net> wrote in message
    news:av9if.2757$KZ2.639@trnddc05...



  6. #6
    David Nakamoto's Avatar
    David Nakamoto Guest

    Default Single Axis vs. Dual Axis drives

    Yes, with a guide scope, or an off-axis guider. But the EQ-3 mount isn't heavy
    duty, so either way adds weight that the mount might not be able to handle,
    depending on the scope you're using. I just don't see any good way to guide
    long term exposures using an EQ-3 setup, not easily and not off the shelf. Of
    course, you can stack a bunch of short exposures; the EQ-3 tracks well enough
    without guiding that this works fairly well, according to my experiments. I
    prefer to stack after the fact using Astrostack or Registax to manually ferret
    out back images, but that's personal preference.

    -- Dave
    --
    ----------------------------------------------------------------------
    Pinprick holes in a colorless sky
    Let inspired figures of light pass by
    The Mighty Light of ten thousand suns
    Challenges infinity, and is soon gone

    david.nakamoto@verizon.net


    "Stephen Paul" <smarshallpaul@gmail.com> wrote in message
    news:xPedne9ZIot5RBTenZ2dnUVZ_s2dnZ2d@comcast.com. ..



 

 

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