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Unitron 80mm spotting scope

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31 replies to this topic

#1 Trevor Cosby

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Posted 21 June 2022 - 10:30 AM

Good day to you.

I have just bought a Unitron/Polarex 80mm spotting scope for £20 in UK to use as a travel scope as my Tal 1 is to big to take away with me.

I read allot about them and watched the you tube video by Dave where he unscrewed the turret to put a star diagonal on it, which I liked the idea of as I could buy a hybrid diagonal so I could use 1.25" eyepieces.

Then the problem, mine seams well and truly stuck on, and won't move.

My question is does anyone know if they were actually glued on, or I am missing a trick.

Secondly if any one has one will I be able to change the 0.965 eyepieces for orthoscopics, as the reviews I have read mention the ones on the turret are not great?

As it was only £20 I plan to repaint it and lube some of the parts that need it, so any maintenance tips would be useful.

It didn't come with a box so plan to make one so any help with dimensions would be helpful

Any guidance would be much appreciated

#2 Dave Trott

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Posted 21 June 2022 - 04:06 PM

You may want to look for a small grub screw on the turret. I cannot remember if mine had one or not but it seems likely that it did.



#3 Trevor Cosby

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Posted 21 June 2022 - 04:44 PM

Dave thanks for getting in touch, I really enjoyed the review on YouTube.

When I removed the small screws from the back of the turret and then removed the turret body and eyepieces, I was left with disk and the spring plate that holds the prism.

I will take another look for the grub screw.when I watched your video you undid a threaded ring the released the turret on its shaft, mine doesn't appear to have this.

The other question is around eye pieces, are you aware if there is any where you can get an updated eyepiece vwirh the external thread that allows it to be screwed in to the turret.

Any help would be greatly appreciated.

Trevor

#4 Trevor Cosby

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Posted 21 June 2022 - 05:09 PM

Some photos of the Unitron/Polarex 80mm spotting scope 

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#5 deSitter

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Posted 21 June 2022 - 05:12 PM

Some photos of the Unitron/Polarex 80mm spotting scope 

Well there's the problem, corrosion has frozen the threads. You need to attack it with penetrating oil and strap wrenches. Don't worry about getting it on the optics, you can clean that up later.

 

-drl


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#6 Trevor Cosby

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Posted 21 June 2022 - 05:26 PM

Hi

 

Thanks for replying, I thought that this mi go JT be old grease, as when I first got it the focuser was all t he eveay in, antook a bit oforce to get it to move out, will try some WD-40and see what happens. 

 

I would also like to find if the eyepieces can be changed on the turret for something a bit better.

 

Again thanks.

 

Trevor 



#7 deSitter

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Posted 21 June 2022 - 05:31 PM

Hi

 

Thanks for replying, I thought that this mi go JT be old grease, as when I first got it the focuser was all t he eveay in, antook a bit oforce to get it to move out, will try some WD-40and see what happens. 

 

I would also like to find if the eyepieces can be changed on the turret for something a bit better.

 

Again thanks.

 

Trevor 

WD40 is not enough - you need penetrating oil designed for this purpose.

 

https://www.youtube....h?v=xUEob2oAKVs

 

-drl


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#8 Dave Trott

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Posted 21 June 2022 - 09:28 PM

Glad you enjoyed my Youtube video.

 

Follow drl's advice and be careful. Not too much penetrating oil.

 

Here is the section of my video where I am adapting the scope for a star diagonal:

 

https://youtu.be/e8dc9CGtWo8?t=214



#9 Trevor Cosby

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Posted 22 June 2022 - 12:41 AM

Dave thanks for all your help, have you still got it, if yes any chance you could let me know the case dimensions, as the one I have didn't come with one, and lastly you know on where I might be able to get replacement eyepieces that would fit into the turret?

Many thanks

Trevor

#10 Dave Trott

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Posted 22 June 2022 - 12:53 AM

Hi Trevor,

 

I sold that scope a few years ago. If I remember correctly the eyepieces are sized at .965 inches and you can buy some very high quality replacements. The lower power eyepieces are actually pretty good. I suggest that you try them before throwing them in the trash.

 

- Dave



#11 Trevor Cosby

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Posted 22 June 2022 - 01:10 AM

Hi Dave

As always thank you for the advice, am I being a bit dense, as I can't remember seeing 0.965 eyepieces that have external screw threads for screwing into the turret.

If you could point me in the right direction it would be a great help.

Many thanks

Trevor

#12 Terra Nova

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Posted 22 June 2022 - 08:36 AM

I had one that I converted to an astronomical telescope some years ago:

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#13 Trevor Cosby

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Posted 22 June 2022 - 08:45 AM

Hi

Thanks for getting in touch, can you tell me how you removed the turret and how you hold the stat diagonal in place.

Mine didn't come with s storage box, would you happen to know its dimensions as I plan to make one.

Again many thanks.

Trevor

#14 Dave Trott

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Posted 22 June 2022 - 09:55 AM

On mine the eyepieces were "slide in" and the tubes that held them were screwed in. Apparently yours is different. There was some variation in these scopes.


Edited by Dave Trott, 22 June 2022 - 09:57 AM.


#15 Trevor Cosby

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Posted 22 June 2022 - 05:14 PM

Hi Dave

Mine didn't have a grub screw so will now focus on the refurbishment, any suggestions on best paint for the scope?

As always many thanks

Trevor

#16 Dave Trott

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Posted 22 June 2022 - 07:48 PM

You are most welcome, Trevor.

 

You're going to have a difficult time matching the paint on that scope; at least I did. Good luck with that!



#17 Trevor Cosby

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Posted 25 June 2022 - 05:05 AM

Dave

As always thank for responding, I plan to take it down to a local paint supplier to see if they can march it up.

The problem is mine is so faded, so I was wondering if you have a high Res photo of the one you had, which I could print and take down to the paint supplier.

Again thank you.

Regards

Trevor

#18 Stew44

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Posted 25 June 2022 - 06:28 AM

The outside dimensions of the case are 21-3/4" x 8-3/4" x 4-1/2".  Typical 1/2" plywood stock.

 

P6250087.JPG

P6250088.JPG

P6250089.JPG

 

 


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#19 Stew44

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Posted 25 June 2022 - 06:34 AM

The paint is a tiny crinkle light brown.

 

P6250091.JPG

 

Mine looks to have the turret threaded to the drawtube (and the foam padding in the case says probably a later one than yours).

 

P6250092.JPG


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#20 Trevor Cosby

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Posted 25 June 2022 - 06:37 AM

Stew

 

Thanks for the photos and information, have you ever removed the turret to use a star diagonal for astronomy use.

 

Some photos of mine

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#21 Terra Nova

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Posted 25 June 2022 - 06:49 AM

This aluminum piece should unscrew. They made one to mate the helical focuser to the turret and one to mate the focuser to a 0.965” visual back (as you can see from my post above). The Spotter came in two options, one with the turret and one with a 0.965” porroprism for use with single eyepieces.

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Edited by Terra Nova, 25 June 2022 - 08:46 AM.

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#22 Trevor Cosby

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Posted 25 June 2022 - 07:39 AM

That ring is missing on the one I have, the only screw ring that is the one on the 8nside of the one you have marked that holds the helical focus operating ring.

#23 Terra Nova

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Posted 25 June 2022 - 08:06 AM

There has to be a way to unscrew A from B. They aren’t a single piece. If there isn’t a small grub screw locking them, they must be frozen. Have you tried WD40, strap wrenches, heat?

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#24 Trevor Cosby

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Posted 25 June 2022 - 08:26 AM

Hi

Tried Wd40, with no luck there is no sign of a focus tube on the turret inside face and no sign of a grub screw, weird or what🤨

Many thanks

Trevor

#25 Dave Trott

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Posted 25 June 2022 - 08:48 AM

Terra is right. There has to be some way to separate A from B. 


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