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    47Tuc's Avatar
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    Default Best autoguider for my 180mm Mak-Cas?



    Using a Canon EOS 60D I would have gone with the affordable Orion Starshoot autoguider, but it says "Suitable for scopes up to 1500 focal length". My Mak-Cas is 2700mm focal length. So would the two work together, or which other autoguider would you recommend?
    Paul
    36.85 S 174.57 E
    12" GSO Dobsonian
    Orion 180mm Maksutov-Cassegrain, 8" Richey-Chretien, HEQ5Pro mount
    Explore Scientific 30mm, Baader Hyperion 24mm, 17mm & 8mm, Pentax XW 10mm, TV 2x Barlow

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    Default Re: Best autoguider for my 180mm Mak-Cas?

    Would using the SSAG on the ST80 help out instead of the 50mm in the kit? I think the price works out to be about the same as well. Plus the ST80 may make a nice grab and go.
    Explore Scientific 102mm apo, Orion ST80A, Celestron C90, Canon 50mm F1.8 lens, Celestron 8X42 Nature DX
    CG-5 GT, Explore Scientific Twilight 1, & half a barn door mount (almost finished), Canon 7D, Orion Magnificent Mini AutoGuider, ZWO ASI120MC-S
    ES 82° 2" 6.7mm, 18mm, 30mm, Meade Series 4000 1.25" 25mm plossl, & Celestron 1.25" 32mm plossl eyepieces.

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  4. #3
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    Default Re: Best autoguider for my 180mm Mak-Cas?

    I do not have a direct answer to your question, I have Celestron's NexGuide autoguider package with a 80mm x 600mm fl guide scope.

    Your question inspired me to remember making the choice and I want to mention that somewhere on the web I have read a wonderfully explanation paper/writings by some clever person describing how effective an autoguider wil be based on imager pixel size vs guider pixel size and the effect of focal length and magnification on the error factor generated by difference in pixel size/resolution... This paper cleared up a lot of questions for me and is one reason I purchased a larger than average guidescope for the NexGuider package to get close to the magnification of my prime scope/camera combination...
    Thanks, Mitch - K1FH
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  6. #4
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    Default Re: Best autoguider for my 180mm Mak-Cas?

    Thanks ML, so you're saying that the guidescope is the limiter, not the autoguider itself. Surprisingly I hadn't considered that. Looks like an upgraded guidescope could be a solution unless I hear otherwise.
    Thanks also to Mitch, I'll try to find that website, and look into your setup as well.
    Paul
    36.85 S 174.57 E
    12" GSO Dobsonian
    Orion 180mm Maksutov-Cassegrain, 8" Richey-Chretien, HEQ5Pro mount
    Explore Scientific 30mm, Baader Hyperion 24mm, 17mm & 8mm, Pentax XW 10mm, TV 2x Barlow

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    Default Re: Best autoguider for my 180mm Mak-Cas?

    As I understand, its a combination of the pixel size combined with the magnification factor. The ideal autoguider system will have the same size pixels as the imaging camera and be seeing the target at the same magnification to have the least error...

    Some of the SBIG CCD cameras have an autoguider built in so they see the same image that is being tracked however they are expensive cameras... In my case I'm using a 950mm fl scope and a 600mm fl guide scope, and when I purchased the Nexguide, it uses a sensor that has slightly smaller (closer together) pixels than the camera.

    However I have just this past week upgraded to a higher resolution camera, so don't know at this point until I do the math, just how effective the autoguider I have will be with the new camera...
    Thanks, Mitch - K1FH
    And sidekick Shadow, the precocious one
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    Default Re: Best autoguider for my 180mm Mak-Cas?

    Orion's 50mm/SSAG combo is 150mm focal length, which they say guides up to 1600mm length ota's. Given that, I have guided a 2000mm f/l AT10 with it, although only for testing, for 60 second exposures. Worked fine, although I now use either a 250mm f/l Borg 50mm, or the Telescope Drive Master for imaging.

    Here's an image using the Orion 50mm/SSAG, only a total of 14 mins of data:



    Hope that helps. It works, but I feel better with more than the 150mm of the Orion 50.

    Cheers,

    Paul
    Life's a journey, enjoy the ride
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    xx14g , SVR90T-AP, AT6RC, AT10RC, Borg 60ED. Borg 50mm
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