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Early Unitron find

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#1 PawPaw

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Posted 14 March 2020 - 08:29 AM

Let me start this thread by clearly  stating "I am not a Unitron expert"....far from it.  So far I am enjoying the journey of learning about these classics.  As some of you know I have been an Edmund nut since the early 70's and still am.  By chance last month I stumbled across an 50's Altazimuth OTA in the box but without a mount close by so I jumped.  Never thought I would own a Unitron but now here I am.  Oh and it now has a mount smile.gif

 

Long story short I did not stop looking and searching for information.....Again I stumbled onto what I think is an early 50's Unitron.  A little farther away but close enough to drive and inspect it.  Well the inspection turned into a buy.  After a 650 mile round trip and some sleep thought I would  share what I have found so far and get some input from the experts.  Lets start with the most interesting part so far.....The objective and cell:

 

 

 

 

 

 

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#2 John Rogers

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Posted 14 March 2020 - 08:55 AM

Congratulations!



#3 PawPaw

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Posted 14 March 2020 - 09:01 AM

Thanks John.....guess I have started down the road to become a Unitron nut?  



#4 John Rogers

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Posted 14 March 2020 - 09:14 AM

I am beginning to discover that it is a slippery-slope Don! 

 

Now, of course you will need an authentic Unitron mount and a set of eyepieces.


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#5 PawPaw

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Posted 14 March 2020 - 10:17 AM

This is the first Unitron Lens I have seen like this....I am sure others have seen these but new to me.  The dew shield keeps the objective cell retained.  This dew shield is larger than the one on my 150.  

 

 

 

 

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#6 PawPaw

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Posted 14 March 2020 - 12:02 PM

The lens cell has two aluminum spacers rings around the entire diameter of both the flint and the crown.   One that fits over the crown facing the sky and one on the flint facing the focuser.  Both of them I would describe as  a band....I did not remove it from the crown as it is seems to be stuck.  The one on the flnt stayed in the cell.  The retaining ring screws into the cell and presses on the crowns aluminum ring.  Aluminum spacers are intact and have small dots on the side of the crown marking where they should go.  No register marks or other markings.  The lens looks good, no fog or scratches just dirt and dust.  I will give it a bath later but first I want to try it out as is.  

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Edited by PawPaw, 14 March 2020 - 12:05 PM.


#7 clamchip

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Posted 14 March 2020 - 12:33 PM

wow that is a thin crown.

 

Robert



#8 PawPaw

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Posted 14 March 2020 - 12:50 PM

wow that is a thin crown.

 

Robert

The aluminum band slides over and around the crown that makes it look thinner than it is.  Ever seen a band like that?


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#9 clamchip

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Posted 14 March 2020 - 01:14 PM

No I have not seen a band like that.

Without the bands is the lens too small in diameter for the cell?


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#10 PawPaw

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Posted 14 March 2020 - 01:57 PM

According to the seller it was all original if that is true the bands came from Unitron that way.  I have no reason to doubt him.  I did not take the bands off.  The lens fit back into the cell easily but no noticeable looseness.  


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#11 walter a

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Posted 14 March 2020 - 04:09 PM

Allright I'll ask the obvious, does it say Unitron anywhere on your instrument or have Unitron peripherals.


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#12 photiost

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Posted 14 March 2020 - 04:20 PM

Please post some images of the OTA and the focuser !! waytogo.gif


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#13 CHASLX200

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Posted 14 March 2020 - 04:41 PM

What is the long black round thing?  I never saw that on a Unitron OTA.


Edited by CHASLX200, 14 March 2020 - 04:41 PM.


#14 AstroKerr

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Posted 14 March 2020 - 04:42 PM

waytogo.gif

The aluminum band slides over and around the crown that makes it look thinner than it is.  Ever seen a band like that?

I believe I saw a similar banded lens objective somewhere in older classics or refractor threads, cruisin' maybe last month. there was a discussion about why - supplier changed lenses but not cell, economics, etc. I'll look.

popcorn.gif


Edited by AstroKerr, 14 March 2020 - 04:44 PM.

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#15 PawPaw

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Posted 14 March 2020 - 05:38 PM

Sorry for the delay had to stop putting this all together and feed the cows.  

 

Lets start here.  It took me all day to remove everything from the boxes and assemble....In the process I cleaned the OTA's and mount with windex.  The OTA box gives a clue as to the model.

 

 

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#16 PawPaw

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Posted 14 March 2020 - 05:54 PM

Some of you may recognize this Unitron.  It has been for sale quite some time but according to the owner no one came to look at it in person.  I don't think it's the model that was advertised.  The OTA's were plated in the 90's. The main OTA is original brass with the large counterweight toward the eyepiece.  The other OTA's were duralumin.   I am debating if I want to powder coat back to the original white.  There are two pieces missing,  a bolt for the accessory tray and a thumbscrew for one of the sun screens.  It came with a 5 piece set of eyepieces gold lettering but no Unitron name just the mm size.  

 

Oh and it has the light tray.....with 40 year old batteries.......(soaking as we speak).  The Photo guidescope objective cell is very similar to the main OTA cell with one difference.  The cell is screwed onto the guidescope ota but once you remove that the objective cell comes out or literally falls out....caught it.  instead of being retained by the dewshield like the main OTA the Photo guidescope  comes out the back side toward the OTA.  Will take some pictures to explain better.

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Edited by PawPaw, 14 March 2020 - 06:08 PM.

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#17 Terra Nova

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Posted 14 March 2020 - 05:57 PM

That is a beautiful scope! I like the brass and black. If the plating is in good shape I would be inclined to leave it. It has a very classic appearance. The boxes look like the standard Unitron model 152 set of three.  


Edited by Terra Nova, 14 March 2020 - 06:02 PM.

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#18 PawPaw

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Posted 14 March 2020 - 06:00 PM

Those definitely look like the boxes for a model 152! Nice!

Thanks Terra.....Look how many OTA's the box was constructed to hold......A 152 did not come with the photo guidescope did it,  and this box is built to hold it.


Edited by PawPaw, 14 March 2020 - 06:39 PM.


#19 Terra Nova

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Posted 14 March 2020 - 06:07 PM

Terra.....Look how many OTA's the box was constructed to hold......A 152 did not come with the photo guidescope did it,  and this box is built to hold it.

 

Maybe the 155 (Photo-equatorial 4” model with guidescope)? I’m trying to remember the layout of my 152s OTA box. It’s been gone for a couple of years. It did accommodate the 10x40 finder but not a guidescope, seems like that came in a separate box (for those that got the 155.



#20 PawPaw

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Posted 14 March 2020 - 06:11 PM

Please post some images of the OTA and the focuser !! waytogo.gif

Standard focuser....There is no rack and focuser tube. The tube is threaded to accept the pinion gear.

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Edited by PawPaw, 14 March 2020 - 06:13 PM.

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#21 walter a

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Posted 14 March 2020 - 06:21 PM

Well that is gorgeous



#22 CHASLX200

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Posted 14 March 2020 - 06:24 PM

What is the long black round thing?  I never saw that on a Unitron OTA.

Thanks for no answer. Now after seeing the pics someone painted the dew cap chaps.
 



#23 PawPaw

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Posted 14 March 2020 - 06:27 PM

Some of the accessories it came with.  Notice the odd shape of the image erector.  

 

I guess they used the red and green cellophane as filters?

 

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#24 PawPaw

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Posted 14 March 2020 - 06:28 PM

Thanks for no answer. Now after seeing the pics someone painted the dew cap chaps.
 

Sorry I guess I missed that.



#25 CHASLX200

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Posted 14 March 2020 - 06:52 PM

Sorry I guess I missed that.

I was sweating that one out. It had me thrown for a loop.  Sure there is not two weighs inside the OTA?  Mine had two weights holding the guide scope.




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