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Evostar 120 star diagonal fit

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#1 stanleymcmahan

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Posted 29 March 2020 - 06:01 PM

Greetings fellow sky gazers,

I use a Sky-Watcher Evostar 120 and have owned it since November 2019.

Very happy with the quality except the fit of the star diagonal in the receiver. The fit is quite loose and I can’t imagine it is centered nor at the correct plane angle to the optical axis of the scope.

It makes me wonder if I am missing something? Maybe a part? Or maybe just my thick head. I’m usually mechanically minded but might be overlooking the obvious.

Anyone with same scope care to guide me on this?

Thanks so much for participating in our collective education. Much appreciated!

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Edited by stanleymcmahan, 29 March 2020 - 06:07 PM.


#2 junomike

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Posted 29 March 2020 - 06:10 PM

That's correct.  IME those Synta Visual Backs are poor.  If the OTA is a main player in your stable this is well worth the cost to upgrade.


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#3 drd715

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Posted 29 March 2020 - 06:22 PM

The 2 inch reciever that threads onto the draw tube can be replaced with a better one or different design. And you can replace the entire focuser with a feather touch or moonlite.

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#4 stanleymcmahan

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Posted 29 March 2020 - 06:25 PM

Thanks so much Hubble. Did not even think about an upgrade being available. 
 

Also, thanks for confirming I am not missing a part or have something assembled wrong!

 

Price seems right too!

 

Thanks again!



#5 Bean614

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Posted 29 March 2020 - 06:28 PM

Get the Baader Click-Lock Visual Back, Period!  I've used it with the Evostar 80, 100, and 120.  Simply wonderful,  AND accurately centers your Diagonal,  Camera, etc.  A little twist and nothing will fall out!


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#6 stanleymcmahan

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Posted 29 March 2020 - 06:29 PM

Thanks drd715, I have seen the moonlight focuser. A little out of my budget right now but I’ll be revisiting that in the future. 

Have not seen the feather touch yet. It’s cloudy here tonight so thanks for the research topic. (Smile)

 

Appreciate you taking the time to respond!


Edited by stanleymcmahan, 29 March 2020 - 06:29 PM.


#7 drd715

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Posted 29 March 2020 - 06:30 PM

Get the Baader Click-Lock Visual Back, Period! I've used it with the Evostar 80, 100, and 120. Simply wonderful, AND accurately centers your Diagonal, Camera, etc. A little twist and nothing will fall out!

Yes I second.

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#8 stanleymcmahan

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Posted 29 March 2020 - 06:31 PM

Thanks Bean614. Will check out the Badder too. 
 

It’s a good thing it is cloudy!

 

Thanks for the suggestion. 



#9 Jeff L

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Posted 29 March 2020 - 07:08 PM

It’s a good thing it is cloudy? Shut the front door ! 


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#10 stanleymcmahan

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Posted 29 March 2020 - 07:10 PM

It’s a good thing it is cloudy? Shut the front door ! 

Yes, I was ducking when I said that!! :)

 

Of course, that was tongue in cheek statement I made...

 

Thanks for the smile your post gave me.



#11 ButterFly

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Posted 29 March 2020 - 07:21 PM

+1 for the Baader Clicklock.  If you have an EQ mount, it helps to quickly reposition the diagonal+eyepiece.  It does cost twice as much as the compression ring visual back from post #2, but it is worth it if you move the diagonal a lot.

 

It is a great scope, but the stock visual back is the only thing I do not like about the scope out of the box.  I have had no issues with the focuser itself, with regular tension adjustments.

 

Bear in mind that with either the compression ring or clicklock visual backs, the diagonal tilt depends mostly on how you put the diagonal on when you tighten.  I tend to make the diagonal stops flush with the clicklock, then tighten, while maintaining a slight pressure.  I won't make a huge difference visually (as long as your stars are collimated in and out of focus), but replacing that stock visual back is very much a safety issue for your eyepieces.


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#12 stanleymcmahan

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Posted 29 March 2020 - 07:37 PM

+1 for the Baader Clicklock.  If you have an EQ mount, it helps to quickly reposition the diagonal+eyepiece.  It does cost twice as much as the compression ring visual back from post #2, but it is worth it if you move the diagonal a lot.

 

It is a great scope, but the stock visual back is the only thing I do not like about the scope out of the box.  I have had no issues with the focuser itself, with regular tension adjustments.

 

Bear in mind that with either the compression ring or clicklock visual backs, the diagonal tilt depends mostly on how you put the diagonal on when you tighten.  I tend to make the diagonal stops flush with the clicklock, then tighten, while maintaining a slight pressure.  I won't make a huge difference visually (as long as your stars are collimated in and out of focus), but replacing that stock visual back is very much a safety issue for your eyepieces.

Yes, just looking at the Baader. A little more expensive but this looks like something that would be justified. For what it does, the price seems fair enough. I see why it would be an advantage. 

 

Thanks for the hint on seating the diagonal. Good pointer there.

 

I do have an EQ mount and have rotated the eyepiece a couple of times while scrunching up my forehead and holding my breath...

 

Thanks so much!



#13 ButterFly

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Posted 29 March 2020 - 08:08 PM

It's the M68  M56 thread clicklock, for reference.  It remember it being hard to find out which one.


Edited by ButterFly, 29 March 2020 - 08:13 PM.

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#14 stanleymcmahan

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Posted 29 March 2020 - 08:19 PM

It's the M68 thread clicklock, for reference.  It remember it being hard to find out which one.

Thanks for that. Looks like OPT carries it but is a 74 with 68i-74i adapter?

 

 

Appreciate it so much.



#15 stanleymcmahan

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Posted 29 March 2020 - 08:25 PM

Thanks for that. Looks like OPT carries it but is a 74 with 68i-74i adapter?

 

 

Appreciate it so much.

Just searched for M68 and found that Highpoint Scientific has the M68 without needing an adapter ring. Thanks again.


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