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Convert Celestron 9x50 finder to guide scope

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6 replies to this topic

#1 Peter in Reno

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Posted 25 May 2016 - 07:38 PM

I am helping a friend who owns a CPC1100 with HD Pro wedge and wants to get started in Deep Sky Imaging. He also has f/6.3 focal reducer, Lodestar X2 and ordered ASI1600-cooled color camera. Since he is a beginner, I suggested he start guiding with a finderscope converted to guide scope because it's easier than OAG. Please do not make any suggestions to use OAG because that will come later when he wants to advance to next level.

 

The eyepiece of Celestron finderscope can be removed and it appears to be 2" or M48 threads because I can screw in a 2" eyepiece barrel into the rear part of the finderscope. I believe I found necessary adapters to accommodate 1.25" guide cameras like Lodestar. Here is what I found so far and I am asking whether they will work:

 

Blue Fireball M48 (2" Filter) Male Thread to T / T2 Male Thread Adapter - Longer Threads # T-05A

 

Baader 1.25"/T-2 Budget Eyepiece Holder # EYEHOLD-1 2458120

 

The first link will screw into 2" or M48 at rear of finderscope. The second link will screw into the first link and Lodestar can be inserted inside the 1.25" eyepiece holder.

 

Thanks,

Peter



#2 Peter in Reno

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Posted 25 May 2016 - 07:57 PM

Maybe an alternative to the first link above:

 

http://agenaastro.co...l-t-thread.html

 

Note the thumbscrews holding the nosepiece, I could remove the nosepiece and attach the adapter over the rear of finderscope and tighten it with thumbscrews. Then the second link from original post (OP) can screw on the alternative adapter. Would that work?

 

Peter



#3 Peter in Reno

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Posted 26 May 2016 - 10:57 AM

Bump. Anyone convert Celestron 9x50 finderscope to guide scope using Lodestar X2?

 

Thanks,

Peter



#4 FirstC8

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Posted 26 May 2016 - 06:53 PM

With a finderscope when the eyepiece is removed, the guider needs much closer to the objective to focus, but because of the X2 body I think you can do it.

Might need some additional holes and thumbscrews to make it rigid.

Edited by FirstC8, 26 May 2016 - 06:57 PM.


#5 syscore

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Posted 26 May 2016 - 09:12 PM

For the trouble of converting a finder to a guide scope, I would get this instead...

 

http://www.telescope.../20/p/99607.uts


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#6 A. Viegas

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Posted 26 May 2016 - 09:42 PM

There are many threads on CN discussing how to do this. A few years ago I did a sloppy 50mm mod. But hey it worked. See old post here. http://www.cloudynig...er-focus-w-dsi/

Al

#7 theocerboneschi

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Posted 10 October 2018 - 01:59 PM

For those, like me, trying to use their finder as a guider here are some updated links to some parts that are available:

 

https://www.highpoin...r-t2-125-holder

 

https://www.highpoin...pter-sfa-m48f42

 

Cheers


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