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Equipment Discussions >> Classic Telescopes

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JonH
sage
*****

Reged: 04/07/12

Loc: Brisbane Australia
Re: Unitron 131-C new [Re: Dave M]
      #5709674 - 03/02/13 10:29 PM

I am curious about the box that came with your beautiful scope. I cant picture what it was supposed to hold. If it is too narrow for a folded refractor what bit of kit would have fitted those supports? I guess it could have been a scope and tripod container as sold with some of the Unitron 114s, but if that is the case why arent there any eyepiece or prism holders and no divider to stop the tripod messing with the OTA?

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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: Unitron 131-C new [Re: JonH]
      #5709703 - 03/02/13 10:54 PM

I`m curious also, im hoping someone recognises it and knows what its for.
Its outer dimensions are 22" long x 9" wide x 4.5" deep.


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gelkin
Pooh-Bah
*****

Reged: 09/22/10

Loc: Western, MD.
Re: Unitron 131-C new [Re: Dave M]
      #5709712 - 03/02/13 11:00 PM

Its not very long. I wonder if it is from a spotting scope.

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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: Unitron 131-C new [Re: Dave M]
      #5709743 - 03/02/13 11:25 PM

The folded Unitron is one of my favorite scopes. Never seen one in person, but hope to someday. Is the image somewhat dimmed due to the mirrors? Nothing modern coatings couldn't fix. The steadiness on the mount must be radically improved with so short a tube.

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bremms
Carpal Tunnel
*****

Reged: 08/31/12

Loc: SC
Re: Unitron 131-C new [Re: Joe Cepleur]
      #5709862 - 03/03/13 02:01 AM

At that age those mirrors are 70% reflective each so you are about 50% throughput on the mirrors. Your 3" has about as much light to the eyepiece as a 2.2" scope. Plus alignment issues, more wavefront error and scattering. Might be a cool scope, but performance will suffer.

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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: Unitron 131-C new [Re: bremms]
      #5710217 - 03/03/13 09:43 AM

The scope's flaws are as expected. Still, it's a classic, and insanely cool! Looking at the mounts of the day, the increased steadiness must have somewhat offset the degraded image, but not much. Optically, sounds as though it's like having a good, but not great, 60mm that nevertheless has the resolution of a 3-inch. Still, it's a quirky favorite of mine.

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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: Unitron 131-C new [Re: bremms]
      #5710270 - 03/03/13 10:09 AM

One could "assume" that might be the case.
The mirrors look in excellent condition given their age.
Since they are in such excellent condition i have no plans to have modern coatings applied.


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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: Unitron 131-C new [Re: Dave M]
      #5710479 - 03/03/13 11:41 AM

A lot goes into choosing a telescope, from the expectation of what one might see, to the ease of carrying it outside, to the ineffable pleasure of using it. All told, the folded Unitron is one of the greats, a good-sized refractor in the ultimate grab-and-go package, surrounded in the glow of history and ingenious design. Congratulations!

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Dave M
Postmaster
*****

Reged: 08/03/04

Loc: Ohio
Re: Unitron 131-C new [Re: Joe Cepleur]
      #5710508 - 03/03/13 11:55 AM

Thanks! Joe, i couldnt agree more, very well stated.

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starman876
Postmaster
*****

Reged: 04/28/08

Loc: VA
Re: Unitron 131-C new [Re: gelkin]
      #5710535 - 03/03/13 12:22 PM

That small box is for the Unitron 80mm spotting scope.

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starman876
Postmaster
*****

Reged: 04/28/08

Loc: VA
Re: Unitron 131-C new [Re: starman876]
      #5710540 - 03/03/13 12:24 PM

And if you are interested you can, out of two of those spotting scope boxes, make a box that will hold the 131C. If you would like pictures of how I did it just ask.

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starman876
Postmaster
*****

Reged: 04/28/08

Loc: VA
Re: Unitron 131-C new [Re: bremms]
      #5710544 - 03/03/13 12:26 PM

Exactly why I am planning to replace the mirrors in one of mine to see if I can improve the performance of the 131C.

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terraclarke
Post Laureate
*****

Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: Unitron 131-C new [Re: starman876]
      #5710555 - 03/03/13 12:29 PM

Precisely why I like the thru-put of a straight thru design coupled with a quality prism. No mirrors (I don't smoke)

Terra


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starman876
Postmaster
*****

Reged: 04/28/08

Loc: VA
Re: Unitron 131-C new [Re: terraclarke]
      #5710563 - 03/03/13 12:36 PM

This was Unitron attempt to counter the high end shorter focal legth APO's. I always wonder what would have happened if they would have started making APO telescopes. I do know they attempted to start selling telescopes again, but in order to compete with price market were obtaining products out of China. However, they could not find a source to be able to produce the quality that people were expecting from Unitron so they left the telescope market completely.

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Dave M
Postmaster
*****

Reged: 08/03/04

Loc: Ohio
Re: Unitron 131-C [Re: terraclarke]
      #5710565 - 03/03/13 12:37 PM

Thanks! for the ID on the Unitron box Johann.
Yes, please do post some pictures of you box here, ide love to see them.


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xavier
sage
*****

Reged: 10/31/07

Loc: Belgium
Re: Unitron 131-C [Re: Dave M]
      #5710583 - 03/03/13 12:45 PM

Congratulations with your new Unitron. Great find.
Is one of the few missing in my collection.


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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: Unitron 131-C [Re: starman876]
      #5710594 - 03/03/13 12:49 PM

If you do replace them ide be interested in your results.
I dont have any imediate plans on replacing mine but who knows, i could be tempted at some point.


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starman876
Postmaster
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Reged: 04/28/08

Loc: VA
Re: Unitron 131-C [Re: Dave M]
      #5710613 - 03/03/13 01:01 PM

I would think they are at least 1/10 flats. I am not sure it I ever saw any specifications on the mirrors. Considering the wavefront on the objective and 1/10 mirrors I would be surprised it it comes close to 1/4 at the eyepiece. Anybody else have any opinions on this?

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Dave M
Postmaster
*****

Reged: 08/03/04

Loc: Ohio
Re: Unitron 131-C [Re: starman876]
      #5710855 - 03/03/13 03:33 PM Attachment (19 downloads)

Here`s a shot of the objective, apparently mine is also one of the rare green tinted ones, see the next to last page, and last page in this thread.
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4715419/page...
His is marked with a C531 on the lens cell, mine is marked C540.
Thought that was rather interesting..


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mustgobigger
Postmaster
*****

Reged: 06/12/07

Loc: Michigan
Re: Unitron 131-C [Re: Dave M]
      #5710964 - 03/03/13 04:37 PM

I am going to do some testing
With mine when the weather gets a little better.
I think mine will blow away any
60mm let alone 55mm as stated
Above.
maybe ill try a photo light meter
At the eyepiece between mine and
A 60mm.
No one will make me believe
It compairs to 55mm.
I am so swamped it might be awhile
Before I get a chance to test but
I will do that.
I get great views with mine and
No way any of 50 or more 60mm
Scopes I have viewed through
Match it.


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