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Need advice on two different scope setups.

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8 replies to this topic

#1 netboy

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Posted 20 April 2019 - 05:11 PM

So I am looking at two different scopes. First is a Stellarvue SVX102T and the other is a Skywatcher Espirit 120. Both are about the same price. But here is my issue. It will be used for about 90% imaging.  I have a 12" dob I use for visual.

 

I really like the Svx but due to my imaging train (camera, fw + OAG) my backfocus is about 57mm 2mm more than the 55mm needed to use the SV FF/FR.  I really like this scope because it is extremely light and versatile with the use of a FR.  I want to use this scope in the field on an Ioptron cem40.  My only option would be to use a guidescope which I am not fond of due to back experiences in the past.

 

The Espirit 120 seems like a great scope also just heavy.  I worry about not taking it out because it is so heavy.  Also the Riccardi Reducer is 2x the cost of the Stellarvue reducer. But it has a more generous backfocus and I can keep my OAG.

 

Weight at home is no issue as I have an EQ8 on a concrete pier.

 

What would you guys do?



#2 bridgman

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Posted 20 April 2019 - 05:19 PM

IIRC some of the SV FF/FR's can be configured to give you a lot more backfocus... ie they are actually made up of a short front section and a long spacer to give 55mm backfocus. Will poke around the site a bit and see if I can find an example (particularly for the SVX102T).

 

EDIT - looks like there are two different options - the SFF4 flattener and the SFFR.74 flattener/reducer - which were you thinking about ?

 

Also looks like the Esprit 100 and 120 both include the flattener.


Edited by bridgman, 20 April 2019 - 05:27 PM.

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#3 Esso2112

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Posted 20 April 2019 - 06:03 PM

I have the SVX80 with the dedicated field flattener and it does have a removable section so that you can use cameras that require more space than the 55mm. You would just need to have an adapter made. 



#4 scadvice

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Posted 20 April 2019 - 06:27 PM

My Stellarvue 130 SVA (The SVA is last years verson to the SVX) and it also has a section that unscrews (A 3 inch Feather-Touch) Their focuser is the same configuration. 

 

I like the Stellarvue very much. I also live only an hour from them...

 

Give them a call they are very responsive. 


Edited by scadvice, 20 April 2019 - 06:29 PM.


#5 Luna-tic

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Posted 21 April 2019 - 06:03 PM

What if you took the OAG out of the train and went to a separate guide scope?  That ought to buy you a few mm for the imaging camera.



#6 netboy

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Posted 21 April 2019 - 06:30 PM

What if you took the OAG out of the train and went to a separate guide scope?  That ought to buy you a few mm for the imaging camera.

 

This is what I want to avoid because I have had bad experiences with a separate guidescope.  When I switched to OAG all my issues went away.  I am going to contact SV after the holiday and see what they have to say.



#7 StarThoughts

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Posted 30 April 2019 - 09:55 AM

I recommend calling Stellarvue, as others have mentioned. They can probably either fit the FF/FR with an adapter that would work or custom make one for you. They customized an adapter for me recently. It was a great customer service experience.


Edited by StarThoughts, 30 April 2019 - 09:55 AM.


#8 AntMan1

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Posted 30 April 2019 - 09:27 PM

If you want round stars stay away from Stellarvues chinese focuser as it sags with 3 pounds on it. On top of that there reducers are just as bad.



#9 Jarno

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Posted 01 May 2019 - 11:22 AM

How about using the TS 0.79x reducer? It's both cheaper than the Riccardi and requires much less backfocus. I have one arriving for my TS 130mm f/7 tomorrow so of course the weather forecast for this weekend is absolutely horrible. I already have the TS flattener and that's doing a very good job.

 

Jarno




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