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Orion 120 at f5

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#1 pdenning

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Posted 01 December 2019 - 09:04 PM

I'm sure it's been mentioned here before. I just got the 120 at I'm using as my primary imagining scope and as I have already read the focuser is at best substandard. I'm looking for suggestions on a good upgrade preferably 200 or less.
thanks for any input
Patrick

#2 Astro-Master

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Posted 01 December 2019 - 09:47 PM

The Orion 120 F/5 Achromat is not suited for imagining, too much CA.  Buying a new focuser for it would be like putting lipstick on a pig.  Save your money, buy a nice APO and a good mount, then you can spend even more money for all the rest of the equipment you'll need.  


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#3 BFaucett

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Posted 01 December 2019 - 10:25 PM

I'm sure it's been mentioned here before. I just got the 120 at I'm using as my primary imagining scope and as I have already read the focuser is at best substandard. I'm looking for suggestions on a good upgrade preferably 200 or less.
thanks for any input
Patrick

 

GSO focusers:

https://agenaastro.c...ractor-gso.html

 

GSO Focuser Compatibility:

https://agenaastro.c...patibility.html

The Orion ST120 uses either the GSO96 (96.6 mm) or the GSO112 (112.5 mm) focusers.

 

How to Attach a Finder to your Crayford Focuser:

https://agenaastro.c...rd-focuser.html

 

Cheers!  Bob F. smile.gif


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#4 nirvanix

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Posted 02 December 2019 - 05:18 PM

Looking at the reviews and image gallery on Orion's website, it appears that lots of people are having success using the 120 ST for imaging. It could definitely use a focuser upgrade. I put a GSO 2-speed from Agena Astro on my Orion 100 f/6. Turns out the lens was sharper than my two apos so it was well worth doing.


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#5 LDW47  Happy Birthday!

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Posted 02 December 2019 - 05:56 PM

GSO focusers:

https://agenaastro.c...ractor-gso.html

 

GSO Focuser Compatibility:

https://agenaastro.c...patibility.html

The Orion ST120 uses either the GSO96 (96.6 mm) or the GSO112 (112.5 mm) focusers.

 

How to Attach a Finder to your Crayford Focuser:

https://agenaastro.c...rd-focuser.html

 

Cheers!  Bob F. smile.gif

Theres nothing more to say, its all right here, I have 2 of then they replace the original in about 20 min. ! One single and one two speed.


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