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..
Unitron 131-C
Started by
Dave M
, Mar 02 2013 11:12 AM
279 replies to this topic
#1
Dave M
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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
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..
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..
#2
Dave M
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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.
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.
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#3
Dave M
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Posted 02 March 2013 - 11:17 AM
One shot of the mount..needs a good cleaning, and i`ll relube it.
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#4
Dave M
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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
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
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Vostok 1
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
Jan-Netherlands
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#6
Da Bear
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Apollo
Posted 02 March 2013 - 11:56 AM
Just wonderful...
Da Bear
Da Bear
#7
tim53
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James Webb Space Telescope
Posted 02 March 2013 - 12:52 PM
Wow, you done good with that purchase!
-Tim.
-Tim.
#8
niteskystargazer
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Voyager 1
Posted 02 March 2013 - 01:38 PM
Nice Unitron Dave !
.CS,KLU,
,Tom
#9
Wisconsin Steve
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Fly Me to the Moon
Posted 02 March 2013 - 01:41 PM
Awesome!
#10
Terra Nova
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ISS
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 
#11
Joe Cepleur
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Soyuz
Posted 02 March 2013 - 03:20 PM
What bends the light inside those tubes, prisms or mirrors?
#12
starman876
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Nihon Seiko
Posted 02 March 2013 - 05:38 PM
Mirrors. Flats.
#13
Dave M
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Posted 02 March 2013 - 05:39 PM
Gee!, i didnt know Unitrons were so popular around here , i do realy appreciate all the nice comments from everyone, Thank! You All.
I have to give another Big Thanks! to my friend 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
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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.
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.
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#15
Dave M
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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
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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.
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#17
Dave M
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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.
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#18
Dave M
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Posted 02 March 2013 - 06:00 PM
Box inside..
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#19
Joe Cepleur
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Soyuz
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
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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
Sorry if i was confusing on it.
#21
JonH
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Viking 1
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
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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.
Its outer dimensions are 22" long x 9" wide x 4.5" deep.
#23
gelkin
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Posted 02 March 2013 - 11:00 PM
Its not very long. I wonder if it is from a spotting scope. 
#24
Joe Cepleur
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Soyuz
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
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Fly Me to the Moon
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.
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