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Need adapter to convert finderscope into guide scope

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#1 earthltd

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Posted 22 October 2020 - 06:52 PM

I have an old Orion 9 x 50mm finderscope that I would like to use with a ZWO ASI MINI camera.  I have tried to find an adapter but the thread size on the scope are unknown.  They are not M42, M48 or 1.25". 

 

Has anyone achieved this conversion?



#2 Bowlerhat

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Posted 22 October 2020 - 07:26 PM

There's an adapter on TS optics for 50mm finder to able to accept straight through 1.25" eyepieces (no diagonal). I don't remember wether it's a thread adapter or a helical focuser though. You can try searching it.



#3 earthltd

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Posted 22 October 2020 - 08:47 PM

I will search for it, thanks.



#4 Don W

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Posted 23 October 2020 - 10:49 AM

If it's a RA finder you will need an extension tube of some sort as well.



#5 MikeECha

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Posted 24 October 2020 - 10:56 PM

I have an old Orion 9 x 50mm finderscope that I would like to use with a ZWO ASI MINI camera.  I have tried to find an adapter but the thread size on the scope are unknown.  They are not M42, M48 or 1.25". 

 

Has anyone achieved this conversion?

We are both trying to do the same thing. I have a 90 deg. finder that came with my SW Evostar 80 ED that I wanted to convert to a guider.

 

In my case, the finder scope thread is M51 x .75. I got that info from FLO page of the adapter. They sell it for about USD $30. I also needed a clamp to attach it to the V plate.

 

But I just decided to order a guider from Amazon in stead. It was less than $20 more with the bracket to mount it and I do not have to wait.



#6 earthltd

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Posted 26 October 2020 - 07:27 AM

We are both trying to do the same thing. I have a 90 deg. finder that came with my SW Evostar 80 ED that I wanted to convert to a guider.

 

In my case, the finder scope thread is M51 x .75. I got that info from FLO page of the adapter. They sell it for about USD $30. I also needed a clamp to attach it to the V plate.

 

But I just decided to order a guider from Amazon in stead. It was less than $20 more with the bracket to mount it and I do not have to wait.

Ha.  When I added up troubles and cost to the uncertain result, I ordered a complete 60mm solution for not much more.  Thanks for the the scope thread info.  I may yet use it.



#7 AhBok

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Posted 26 October 2020 - 07:54 AM

I accomplished this a few years ago by fitting a spare 2”-1.25” eyepiece adapter into the finder tube with a little epoxy. It was a perfect fit. Then you find focus by sliding the guide cam in and out the adapter. You may need to use an extender depending on your camera and whether the finder is RA or straight-thru.

#8 skywolf856

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Posted 26 October 2020 - 07:48 PM

Here is a document to convert a standard  8x50 straight finder to a guider.

Attached File  Project 3 GSO 8x50mm Guidescope.pdf   353.07KB   17 downloads

 



#9 skywolf856

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Posted 26 October 2020 - 07:49 PM

I went even cheaper with a PVC adapter and some thumb screws.




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