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Non goto Mount for Orion 120 F8.3

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#1 Shane1200

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Posted 06 June 2020 - 06:02 PM

I recently purchased a Orion 120 mm F8.3 refractor from a club member.  I have 2 dobs and 102 refractor so I really didn't need another telescope but  I couldn't resist buying it. I  looking for a non-goto mount that would be easy to use with it. This would be a road trip telescope mostly.  What alt-azimuth or eq mount would work with this telescope?  I was thinking about the Celestron cg-4 if I went the eq route.  I have no idea what Alt-azimuth would work with this Orion. The previous owner had upgraded the focuser with GSO crayford so it's heavier than standard Orion 120 F8.3.  

 



#2 John Carlini

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Posted 06 June 2020 - 06:08 PM

What is the actual weight and do you plan on doing just visual?



#3 B 26354

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Posted 06 June 2020 - 06:17 PM

That scope's OTA weighs ~9 pounds, and it originally came on an Orion SkyView Pro EQ mount. I use my C8 (~14 pounds, fully loaded) on the un-motorized version of that mount, for visual only, and it handles it perfectly.



#4 vtornado

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Posted 06 June 2020 - 06:33 PM

I had one of these scopes and  it mounts on a CG4.  The CG4 setup is a little shakey.  Better to go with a CG5 class or Sky view pro.

Unfortunately there is no low cost alt-az mount that will handle it.


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#5 John Carlini

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Posted 06 June 2020 - 06:57 PM

I have both the Celestron CG-4 and Orion Skyview Pro EQ mounts.  They are both rated for 20 lbs of visual payload and work well with shorter focal length refractors. A long-tube 120mm f/8.3 could be a bit shaky, even visually. However, if choosing between those two mounts, the Orion has clutch assemblies, making it easier to reposition for different targets...


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#6 dusty99

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Posted 06 June 2020 - 06:59 PM

Yep, CG-4 will be wiggly. I’d go Skyview Pro/Meade LX-70 or more.

#7 Brent Campbell

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Posted 06 June 2020 - 09:07 PM

Look for a used unistar delux (no longer made). Which should handle it easily.


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#8 Jon Isaacs

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Posted 07 June 2020 - 04:16 AM

I have a now obsolete StellarVue MG-2 mount.  These are a version of the SkyTee mount.  It handles a 120mm F/8.3 quite nicely.

 

Bresser 120 .jpg
 
The difficulty with these scopes is that they are demanding of the mount which means the mount will likely be more costly than the scope.
 
Jon

 


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#9 Hesiod

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Posted 07 June 2020 - 04:50 AM

I would use a T-sky/SkyTee (or the maybe Twilight 2) if prefer alt/az; as for eq mounts, an eq5 should do nice, as could any from the Great Polaris series



#10 howardcano

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Posted 07 June 2020 - 03:04 PM

I had the Orion 120 f/8.3 on the Skyview Pro.  The combo was far too shaky for me, even in those moments when the wind dies down (which doesn't happen often here).

 

I sold the scope and kept the mount for use with other telescopes, though I did have to replace the faulty dual-drive electronics with my own.


Edited by howardcano, 07 June 2020 - 03:06 PM.


#11 vtornado

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Posted 07 June 2020 - 04:52 PM

unistar macro-star will handle the scope.  I have one but did not mention it because it is no longer in production.



#12 dusty99

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Posted 07 June 2020 - 07:34 PM

Who is selling unitstar now?


Edited by dusty99, 07 June 2020 - 07:34 PM.



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