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Firstscope 80EQ focuser replacement?

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18 replies to this topic

#1 toucansam

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Posted 17 February 2020 - 03:56 PM

Is it possible to upgrade/replace the focuser on the Celestron Firstscope 80EQ?

 

Thank you.



#2 vtornado

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Posted 17 February 2020 - 04:12 PM

I think scope stuff has some drop in replacement focusers.

The price is more than the scope.

 

What don't you like about the focuser?



#3 toucansam

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Posted 17 February 2020 - 04:18 PM

I would love to try a dual-speed on it.



#4 LDW47

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Posted 17 February 2020 - 04:37 PM

If you are talking the FirstScope 80mm from the 80’s - early 90’s, I changed mine with a well built GSO Crayford from Agena Astro in about 20 min ! All for about $150 or less !  Clear Skies !

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Edited by LDW47, 17 February 2020 - 04:38 PM.

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#5 vtornado

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Posted 17 February 2020 - 04:39 PM

I understand …

 

I have a single speed 2 inch focuser from scope stuff on my Celestron First scope.

I wish it was 2 speed, but I got my focuser for a good price from a member here.

 

A poor man's dual speed is replacing a focuser wheel(s) with a larger diameter wheel.

 

In the days of yore, the focuser wheel was held on by a screw.  Easily removed, and you can

try a jar lid or something similar.  Some later models have the focuser wheel glued or pressed on.

Much harder to remove the wheel.

 

BTW my scope is an 80 f/5, LDW is the 80 f/11, I think they are both referred to as first scopes.

I think they take the same sized focuser???


Edited by vtornado, 17 February 2020 - 04:43 PM.


#6 LDW47

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Posted 17 February 2020 - 04:40 PM

I would love to try a dual-speed on it.

With that scope you really don’t need a two speed but they are only about $25 more if I remember correctly !  Clear Skies !



#7 Jond105

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Posted 17 February 2020 - 05:02 PM

https://luntsolarsys...cuser-3-travel/

 

just ordered one of these myself from Lunt. It’s the best price and a drop in replacement. 



#8 Jon Isaacs

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Posted 17 February 2020 - 05:03 PM

Is it possible to upgrade/replace the focuser on the Celestron Firstscope 80EQ?

 

Thank you.

 

As others have said, it's possible but it will cost over $100.  You can also just clean and adjust the focuser and that can be a significant improvement. 

 

There are several versions of the Firstscope 80EQ. Most are F/11 but there's an older version that's F/5. The OTA is model 21072.

 

Celestron ST-80 First Scope 80 EQ.jpg
 
Which version do you have?
 
Jon


#9 Jond105

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Posted 17 February 2020 - 05:06 PM

The one from Lunt with shipping was $86 shipped. Well worth it if you go that route. 


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#10 LDW47

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Posted 17 February 2020 - 05:14 PM

The one from Lunt with shipping was $86 shipped. Well worth it if you go that route. 

Thats for a 2” Crayford focuser ? That is a steal !  Clear Skies !


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#11 Jon Isaacs

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Posted 17 February 2020 - 05:40 PM

The one from Lunt with shipping was $86 shipped. Well worth it if you go that route. 

 

The Lunt focuser does not come with a 2 inch to 1.25 inch adapter so that adds about $25.  If one is buying a 2 inch diagonal to go with the Lunt 2 inch Focuser, then the adapter is not needed.

 

Jon



#12 toucansam

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Posted 17 February 2020 - 06:01 PM

Thanks to all.  Mine is model 21072.

 

I bought the Lunt.  I have a 2" adapter and diagonal for another scope that I can use with the 80EQ.


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#13 Jond105

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Posted 17 February 2020 - 06:20 PM

Thanks to all.  Mine is model 21072.

 

I bought the Lunt.  I have a 2" adapter and diagonal for another scope that I can use with the 80EQ.

Like Jon I had one fo those myself for a while. 

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#14 toucansam

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Posted 17 February 2020 - 06:32 PM

I've got a number of spotting scopes, and between terrestrial and astro use, I've really grown to love small, light, wide field refractors.  The Celestron, combined with an AZ-GTI, is the simplest grab-and-go setup I could muster, and setup is a breeze.  Plus it works great at dusk, keeping me and the kids from getting bored while we wait for the sky go grow dark.

 

Thanks again to all.  Now I'm looking forward to trying some 2" EPs in the scope.


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#15 Jon Isaacs

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Posted 17 February 2020 - 09:12 PM

Thanks to all.  Mine is model 21072.

 

I bought the Lunt.  I have a 2" adapter and diagonal for another scope that I can use with the 80EQ.

 

Excellent.. 

 

Here's a question for you and Jon D.:

 

I've had three of these. My current one has a metal thread on dew shield and a metal objective cell that threads onto the tube. 

 

Do yours have the metal dew shield and objective cell?

 

Celestron ST-80 Lens Cell and scope.jpg

 

 

Jon



#16 toucansam

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Posted 18 February 2020 - 01:19 AM

There are essentially no metal parts on mine at all, save for the focuser body and tube, which seems to be a combination of aluminum and some sort of pot metal.

 

What kind of ring clamp is that on yours?


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#17 Jond105

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Posted 18 February 2020 - 05:11 AM

Excellent.. 

 

Here's a question for you and Jon D.:

 

I've had three of these. My current one has a metal thread on dew shield and a metal objective cell that threads onto the tube. 

 

Do yours have the metal dew shield and objective cell?

 

 

 

 

Jon

No mine was the plastic lens cell with the dew shield that just slipped over. 


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#18 Jon Isaacs

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Posted 18 February 2020 - 09:33 AM

Thanks Jon and toucansam:

 

I've owned a number of 80mm F/5s and except for this one, they've all had plastic lens cells and slip on dew shields.  I'm keeping this one.

 

Jon


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#19 Jond105

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Posted 19 February 2020 - 07:22 PM

So I just my dual speed focuser in from Lunt(GSO), had to rotate it but other than that, I like it better than the Synta standard dual speed focuser. Held my ES82 30mm nicely. 

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