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Equipment Discussions >> Classic Telescopes

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Dave M
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Re: Unitron 131-C new [Re: Dave M]
      #5712602 - 03/04/13 02:01 PM Attachment (18 downloads)

Quote:

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..




Just bumping this back up since i wanted to know if anyone had any information about the green lens being rarer ?
Did only a certain number of 131-C`s have it, and can anyone tell me how many Unitron model 131-C`s were believed to been produced ?
Thanks!


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terraclarke
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Re: Unitron 131-C new [Re: mustgobigger]
      #5712732 - 03/04/13 03:24 PM

"also some 75mmon unitron
were known to have iffy optics...
More than a few threads over the years
Of buyers getting duds."

Hi Brian,

Just a note here, not disputing you, but it was my understanding that the 3 inch Unitron objectives were overall very very good, some of the very best the company was known for and that the ones with problems tended to be the 4 inch objectives, some of which were duds as you say?

Anyone else want to clarify this?

Terra


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terraclarke
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Re: Unitron 131-C new [Re: Dave M]
      #5712735 - 03/04/13 03:28 PM

That's a gorgeous objective Dave. I wonder if the green coatings on these which look different than those on other Unitrons (mine for instance) might be some of what is increasing the light throughput despite the additional reflective surfaces as Brian has noted.

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starman876
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Re: Unitron 131-C new [Re: Dave M]
      #5712752 - 03/04/13 03:36 PM

reportedly 100 131C's
None of the 131C's I have are with a green lens. I was hoping because rumor had it they were made by Pentax.


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Dave M
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Re: Unitron 131-C new [Re: terraclarke]
      #5712779 - 03/04/13 03:50 PM

Thanks! Terra, it could be but i couldnt say for sure.

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Dave M
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Re: Unitron 131-C new [Re: starman876]
      #5712798 - 03/04/13 04:00 PM

Quote:

reportedly 100 131C's
None of the 131C's I have are with a green lens. I was hoping because rumor had it they were made by Pentax.




Thanks! Johann,

100 is what i thought i heard before but i wasnt sure i remembered correctly.
I did just dig this archived thread up and caveman mentions
a green Pentax Unitron objective.
http://www.cloudynights.com/ubbarchive/showflat.php/Cat/0/Number/2010743/page...


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starman876
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Re: Unitron 131-C new [Re: Dave M]
      #5712909 - 03/04/13 04:57 PM

I have a 4" Unitron that I was inspecting the other day and I noticed on this lens when I shined a LED flashlight through the lens I saw a green reflection. The other one I was inspecting showed a blue reflection. I will have to try this on some of the other 4" unitrons to see what color I see. I will have to look to see if the lens has a number on it.

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Dave M
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Re: Unitron 131-C new [Re: starman876]
      #5713002 - 03/04/13 05:39 PM

Just hold and point your lens toward a bright window and move it around a little, you should then see what color the reflection of the window is.

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starman876
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Re: Unitron 131-C new [Re: Dave M]
      #5713086 - 03/04/13 06:33 PM

I will have to wait until the sun comes back out wont I

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sgorton99
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Re: Unitron 131-C new [Re: starman876]
      #5713094 - 03/04/13 06:37 PM

Quote:

I will have to try this on some of the other 4" unitrons to see what color I see.






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starman876
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Re: Unitron 131-C new [Re: sgorton99]
      #5713109 - 03/04/13 06:47 PM

your going to hurt your forehead if you keep doing that

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terraclarke
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Re: Unitron 131-C new [Re: starman876]
      #5713115 - 03/04/13 06:49 PM

There was a strange glowing ball of light in the sky for a short time here today! What could it have been

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starman876
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Re: Unitron 131-C new [Re: terraclarke]
      #5713116 - 03/04/13 06:51 PM

Was it green?

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terraclarke
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Re: Unitron 131-C new [Re: starman876]
      #5713121 - 03/04/13 06:54 PM

No. Strangely yellow!

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starman876
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Re: Unitron 131-C [Re: terraclarke]
      #5713124 - 03/04/13 06:56 PM

wow. I saw that today also. Was going to take one of the 4" unitrons and get a better look at it

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Dave M
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Re: Unitron 131-C [Re: terraclarke]
      #5713150 - 03/04/13 07:15 PM

I think ive seen the yellow thing before

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Dave M
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Re: Unitron 131-C [Re: Dave M]
      #5713190 - 03/04/13 07:33 PM Attachment (12 downloads)

I got bored so here`s a image of the 131-C spec sheet.
Its probably safe to say the 25 year warranty has run out


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sgorton99
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Re: Unitron 131-C [Re: starman876]
      #5713288 - 03/04/13 08:21 PM

Quote:

wow. I saw that today also. Was going to take one of the 4" unitrons and get a better look at it




Awesome! Some pictures of all your amazing scopes would be much appreciated!


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starman876
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Re: Unitron 131-C [Re: sgorton99]
      #5713292 - 03/04/13 08:24 PM

Not sure if I have enough time to set them all up in this lifetime

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starman876
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Re: Unitron 131-C [Re: starman876]
      #5713313 - 03/04/13 08:34 PM



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