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Classic Synta focuser/visual back

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#1 castorpolu11

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Posted 22 October 2021 - 03:48 PM

Can you give me a hand identifying how to upgrade the visual back on this old focuser? The scope is a Synta made Firstscope C80. I've recently cleaned and adjusted the focuser and it's working pretty well now. The weak link for me is the VB. Here's what it looks like:

 

IMG_0506.jpeg

 

You'll notice there is a ring that attaches to the draw tube and then a visual back or eyepiece holder that attaches to the ring. 

IMG_0507.jpeg

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IMG_0505.jpeg

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Here are some measurements

IMG_0511.jpeg

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IMG_0504.jpeg

 

 

Can anyone tell me what size adapter I may need to upgrade the VB? I'd be happy to find something that will screw into the draw tube or the ring. Thanks!


Edited by castorpolu11, 22 October 2021 - 03:48 PM.


#2 Terra Nova

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Posted 22 October 2021 - 06:09 PM

Lots and lots of adapter rings and backs at Agena Astro:

 

https://agenaastro.c...ult/?q=adapters

 

You can often find what you need here to cobble together whatever you want. Also check out their useful resource, Astronomy Threads Explained :

 

https://agenaastro.c...-explained.html



#3 castorpolu11

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Posted 23 October 2021 - 03:11 AM

Thanks Terra, I appreciate the links. I was hoping someone might be able to clue me in as to the size adapter I'm looking for based on experience with the focuser or based on the photos. 


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#4 sdedalus83

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Posted 23 October 2021 - 09:53 AM

I believe the 80 and 90mm Synta achromats all have a drawtube with the same 43mm female threads as the old Vixens. Baader sells a 43mm to t thread adapter.


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#5 castorpolu11

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Posted 23 October 2021 - 01:12 PM

Thank you both! I really appreciate the assistance. 



#6 castorpolu11

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Posted 27 October 2021 - 05:46 PM

My cheap old scope rehab is done for now thanks to you both! The new VB is much better! I cleaned the focuser and replaced the knobs too. For some reason I can't abide the plastic knobs. 

 

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