Jump to content


Photo

Unitron 131-C

  • Please log in to reply
279 replies to this topic

#1 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 11:12 AM

I figured i better start my own seperate thread on this Unitron 131-C before i test the patience of any of the Mods with my posting in the other thread :lol:
Eventually i`ll post some more images but heres a couple ive taken so far, once its all cleaned up i`ll take more.
Here`s one of the tube, the Meade ETX 90RA behind it was tossed into the deal free, Its like new..

Attached Files


  • Perseus_m45 likes this

#2 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 11:16 AM

The Unihex and eyepieces that came with it.
Someone had a t-ring duck taped to the 1.25" tube, so i
need to clean that old dried up glue off it.
I have the focuser tube for the Unihex, its just not in the image, the other tube that is is some sort of extension or something.

Attached Files



#3 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 11:17 AM

One shot of the mount..needs a good cleaning, and i`ll relube it.

Attached Files



#4 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 11:24 AM

Once i get time i`ll post a few more. It came with a Unitron box thats in excellent shape but i`m not sure what its for, it just had some accessories in it.
I`ll also post a objective image, glass and coating are in excellent shape.
What does puzzle me is why it came with 3 aperature reduction masks :)

#5 javago

javago

    Vostok 1

  • -----
  • Posts: 191
  • Joined: 02 Nov 2004
  • Loc: Geldrop-Netherlands

Posted 02 March 2013 - 11:40 AM

Nice Unitron Dave !.....I found one a couple of weeks ago and in a great condition like yours.Only thing missing are the solar plates and rod.Did you get them with your telescope?

Jan-Netherlands

Attached Files



#6 Da Bear

Da Bear

    Viking 1

  • *****
  • Posts: 988
  • Joined: 21 Nov 2006
  • Loc: Kali-Forn-Ya

Posted 02 March 2013 - 11:56 AM

Just wonderful...

Da Bear

#7 tim53

tim53

    Cosmos

  • *****
  • Posts: 9483
  • Joined: 17 Dec 2004
  • Loc: Highland Park, CA

Posted 02 March 2013 - 12:52 PM

Wow, you done good with that purchase!

-Tim.

#8 niteskystargazer

niteskystargazer

    Gemini

  • *****
  • Posts: 3176
  • Joined: 05 Oct 2009
  • Loc: 41-43'-28" N 87-42'-39" W

Posted 02 March 2013 - 01:38 PM



Nice Unitron Dave ! :).

CS,KLU,

:thanx:,

Tom

#9 sgorton99

sgorton99

    Soyuz

  • *****
  • Posts: 3501
  • Joined: 30 Apr 2008
  • Loc: Wisconsin, Madison

Posted 02 March 2013 - 01:41 PM

Awesome!

#10 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5347
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 02 March 2013 - 03:15 PM

Wonderful find. I'm glad you got it. I thought of running up there to have a look too when I saw the CL listing but had to stop myself :help:

#11 Joe Cepleur

Joe Cepleur

    Vanguard

  • -----
  • Posts: 2116
  • Joined: 18 Mar 2010
  • Loc: Dark North Woods

Posted 02 March 2013 - 03:20 PM

What bends the light inside those tubes, prisms or mirrors?

#12 starman876

starman876

    Fly Me to the Moon

  • *****
  • Posts: 6317
  • Joined: 28 Apr 2008
  • Loc: VA

Posted 02 March 2013 - 05:38 PM

Mirrors. Flats.

#13 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 05:39 PM

Gee!, i didnt know Unitrons were so popular around here :lol: , i do realy appreciate all the nice comments from everyone, Thank! You All.

I have to give another Big Thanks! to my friend Tom Kiehl for calling me about this scope about a hr after it appeared on Craigslist, then over the course of a few conversations he persuaded me to call about it and set up a time to go see it, the rest as they say is history.

#14 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 05:45 PM

Hi Jan,

You have a real Beauty there, Congratulations for also finding one.
Yes, mine came with the sun plates, here`s a image of them.
The smaller one on the right is i believe to another telescope, but it was in the box also.

Attached Files



#15 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 05:48 PM

What bends the light inside those tubes, prisms or mirrors?


Hi Joe, it has two first surface mirrors inside, a small 36mm diameter one up by the objective and a 60mm diameter mirror at the focuser end.

#16 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 05:55 PM

Not sure why there was three of these aperature reduction masks in the box, i know you use them for the sun.

Attached Files



#17 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 05:59 PM

The Box, this is the only one that came with it, i`m not sure what its for but its in realy great shape, i know its not for the tube, not deep enough.

Attached Files



#18 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 06:00 PM

Box inside..

Attached Files



#19 Joe Cepleur

Joe Cepleur

    Vanguard

  • -----
  • Posts: 2116
  • Joined: 18 Mar 2010
  • Loc: Dark North Woods

Posted 02 March 2013 - 08:21 PM

What bends the light inside those tubes, prisms or mirrors?


Hi Joe, it has two first surface mirrors inside, a small 36mm diameter one up by the objective and a 60mm diameter mirror at the focuser end.


Took a moment to follow that. The light path is folded. The point is that the larger mirror must be nearer to the objective, and the smaller mirror nearer to the focuser, at least viewed in relation to the direction of photons in the visible spectrum flying along the scope's light cone. They enter a 3" aperture, bounce off the large mirror, then the small mirror, then exit the still smaller eyepiece. If we excited the photons into X-rays so they could pass through the walls, then, sure; due to the folding, the small mirror would be near the objective, and the large mirror near the focuser, but that's not how visible-light photons in the tube see it.

#20 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 09:06 PM

What bends the light inside those tubes, prisms or mirrors?


Hi Joe, it has two first surface mirrors inside, a small 36mm diameter one up by the objective and a 60mm diameter mirror at the focuser end.


Took a moment to follow that. The light path is folded. The point is that the larger mirror must be nearer to the objective, and the smaller mirror nearer to the focuser, at least viewed in relation to the direction of photons in the visible spectrum flying along the scope's light cone. They enter a 3" aperture, bounce off the large mirror, then the small mirror, then exit the still smaller eyepiece. If we excited the photons into X-rays so they could pass through the walls, then, sure; due to the folding, the small mirror would be near the objective, and the large mirror near the focuser, but that's not how visible-light photons in the tube see it.


Yeah, the larger mirror would be closer to the objective if following the light path, physically they are positioned as i mentioned above :grin: Sorry if i was confusing on it.

#21 JonH

JonH

    Mariner 2

  • *****
  • Posts: 287
  • Joined: 07 Apr 2012
  • Loc: Brisbane Australia

Posted 02 March 2013 - 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?

#22 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8258
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 02 March 2013 - 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.

#23 gelkin

gelkin

    Apollo

  • *****
  • Posts: 1272
  • Joined: 22 Sep 2010
  • Loc: Western, MD.

Posted 02 March 2013 - 11:00 PM

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

#24 Joe Cepleur

Joe Cepleur

    Vanguard

  • -----
  • Posts: 2116
  • Joined: 18 Mar 2010
  • Loc: Dark North Woods

Posted 02 March 2013 - 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.

#25 bremms

bremms

    Mercury-Atlas

  • *****
  • Posts: 2773
  • Joined: 31 Aug 2012
  • Loc: SC

Posted 03 March 2013 - 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.






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics