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Thread: New tube rings

  1. #1
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    Default New tube rings



    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
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    Default Re: New tube rings

    I and many others have been where you are...
    Eventually, we've all come to the same conclusion. An OAG.
    How you get there, and how much you spend, is up to you...

    Jim
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    Default Re: New tube rings

    Never had an issue with flexure on any of my scopes using a 9x50 and a stalk. Even the flaky tri-tilt thing Orion has still seems to hold well. Hope it all works great for you.
    My eyes
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    Default Re: New tube rings

    Quote Originally Posted by Leveye View Post
    Never had an issue with flexure on any of my scopes using a 9x50 and a stalk. Even the flaky tri-tilt thing Orion has still seems to hold well. Hope it all works great for you.
    If you take several images in a row, and they tend to move slightly between the first and last... You have flexure.
    I had mine down to one pixel vertical and one horizontal movement per 600 sec exposure, until I changed to an OAG.

    Now every frame looks identical...
    Jim
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    Default Re: New tube rings

    Yikes - OAG is going to require a new OTA, I suspect. I don't think there would be enough back focus in the system to allow for anything additional in the light path while still allowing me to get the DSLR to prime focus. So it may be in my future, but for sure not the near future.

    Bob
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    Default Re: New tube rings

    After reading through XCalRocketMans thread on his drifting stars, I can see the handwriting on the wall. I looked at Celestrons OAG and will have to see how much inward travel I have with the DSLR at prime focus, and see if there is enough to squeeze the OAG in there. In the meantime the rings arrive tomorrow and I hope to try them out. I may also consider getting a third ring to hold the Starhoot camera in place before succumbing to the dark side.

    Bob
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    Default Re: New tube rings

    I got that same feeling reading that thread. If I go the OAG route I may need to get the shorter collar for my Moonlite. But if that's what it takes to really start pushing the sub duration...

    But first I need to get to 5 min rock solid.

    Let us know how the rings work out with the ST80.
    ~ Don ~

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    Default Re: New tube rings

    Quote Originally Posted by jimminCT View Post
    If you take several images in a row, and they tend to move slightly between the first and last... You have flexure.
    I had mine down to one pixel vertical and one horizontal movement per 600 sec exposure, until I changed to an OAG.

    Now every frame looks identical...
    I don't have that issue ever. Just a slight field rotation from the first image and the last which is to be expected they are almost 4 hours apart sometimes. DSS stacks everything just fine so slight movement won't hurt much. As long as the stars are pinpoint I'm fine with it. Hope you can get to the bottom of your issues.
    My eyes
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    Default Re: New tube rings

    As much as it's been maligned, I have the Orion thin OAG and it seems to be doing a fine job up to 1200 sec exposures...
    It takes less than, or just about, a half inch of B/F.

    Orion Thin Off-Axis Guider for Astrophotography | Orion Telescopes and Binoculars

    Here's my current setup with the Hotech FF screwed right into the OAG, then the F/W then the CCD

    OAG setup.jpgOAG setup 2.jpg


    I am fortunate that my mount stays put, and the PA is very good. That's a huge plus.

    Good Luck!
    Last edited by jimminCT; 06-29-2016 at 11:15 PM.
    Jim
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    Default Re: New tube rings

    That OAG looks pretty svelte!
    ~ Don ~

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