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Thread: New tube rings

  1. #11
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    Default Re: New tube rings



    Quote Originally Posted by Sundedo View Post
    That OAG looks pretty svelte!
    It is, which means you need to be careful with the whole setup..
    I leave it cabled and ready to plug the whole thing in once it's on the mount.

    Fortunately, my OTA stays out in the sunroom where it won't get hurt.
    Even my granddaughter won't touch it... I've never had to tell her, she just knows....
    Jim
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  2. #12
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    Default Re: New tube rings

    I hadn't seen the TOAG before. That looks promising, but I'll have to verify it can screw onto the focuser tube, preferably with T-threads.

    Not losing focus here, will try out the new rings and see if I can get that to go, but the weight reduction of an OAG is something I can dream about.

    Then there is the wife who has seen the ST80 mounted and might wonder what happened if it disappeared

    Bob
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  3. #13
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    Default Re: New tube rings

    Quote Originally Posted by bobharmony View Post
    I am getting started with autoguiding and am doing a preemptive strike on possible flexure issues. About half the lights in my first autoguiding attempt had an indication that the guidescope had slipped in relation to the OTA. The star were not egg shaped, but rather they showed as two different points close together, with one being brighter than the other.

    When I bought the autoguider package, the ST-80 came with rings that were 105mm ID, and had plastic screws in the rings that could be tightened to hold the scope in place and adjust it as needed. I am replacing them with 90MM ID rings that should hold the guidescope much more firmly and prevent any sort of movement in the rings. Since I won't be using the autoguider as a finder scope - once I get the StarShoot camera to focus, I am locking it down and never moving the focuser again - I don't need the adjustment to be available.

    I don't know that is an issue, but it will be one less thing for me to chase (I hope).

    Bob
    I've done the same thing, with my 50mm on top of my SV80. So far so good.

    Now I can't say the same for my other setup, 50mm on top of a 9.25. For that I'm going with ONAG.

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    bobharmony (06-30-2016)

  5. #14
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    Default Re: New tube rings

    I took a look at the ONAG - It seems like a nice combination of features. It removes the issue of flexure and restores the ability for the guide camera to have a wider set of potential guide stars (although not as wide a field as the ST-80 provides. The 66mm of back focus for the SC model might also push beyond my limits.

    I appreciate all the responses to the OP. You all have certainly given me lots to think about and you have exposed me to a bunch of new (to me) possibilities. Saturday night is looking clear here. If the rings come today - as scheduled - i hope to get out and give that a whirl on Saturday.

    Bob
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  6. #15
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    Default Re: New tube rings

    So I am officially POed at the moment. I went to mount the ST-80 in the 90mm rings on the dovetail bar Orion sent with the Autoguider package, and there was no set of holes in the bar close enough to fit the scope. It would have been just right, except there are three screws that hold the focuser assembly in place and they prevented the rings from fitting properly and closing.

    I guess my next step is to drill a hole in the dovetail bar a little closer and see if that helps the rings close over the tube. I am not at all confident about that piece of work using my hand held battery drill to get a hole through a pretty heavy-duty piece of steel. In the meantime I am back to trying again with the 10mm rings and plastic holding screws with mixed results tonight.

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    Default Re: New tube rings

    I was able to do a little surgery on the dovetail bar and get the ST80 installed piggyback using the 90mm rings. OK, so I drilled a hole a little closer to the front ring hole and was able to get the tube on and miss the screws that hold the focuser assembly.

    I will try to post a pic tomorrow, the combined assembly feels rock solid now.

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  8. #17
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    Default Re: New tube rings

    As promised here is a shot of the new setup with the snug 90mm rings for the guide scope. It all feels very solid t the moment. If I could figure out a way to support the starshoot camera at the end of the ST80, I would do that too. It's pretty small in diameter, I'll give it some thought.

    IMG_6946.jpg

    If you look closely you can see my main assistants legs sticking out from under the chair.

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    Default Re: New tube rings

    Heh it reminds me of those stacking dolls. Or vaguely reminiscent of the space shuttle atop a 747

    Once you get the guide scope working you can shed that finder and at least a little weight.
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