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Brass Unitron 102mm F15 OTA

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57 replies to this topic

#1 starman876

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Posted 26 March 2021 - 05:25 PM

I got this brass OTA from Unitron this year when their Sr Vice President Peter Andrico retired.  Peter and I have been friends for a number of years and he first offered me this Brass Unitron about 10 years ago.  When he retired he asked me if I wanted this scope and a bunch of other Unitron gear they had laying around.   The Brass tube is larger than the original unitron 102mm tube and therefore the lens cell and focuser fit inside the OTA instead of around the OTA like the original 102mm Unitron.   Unitron made this OTA to sit in their lobby.   It is pretty heavy as brass would be.  Unitron also made the 40mm finder out of brass.  They put a super focuser on it.  They never made a dew shield for it so I put one on it.   I will see if I can find a brass dew shield that will fit.  I will also put it on a Unitron mount once I fix up one of the 4" mounts with a Vixen adapter.  

 

Brass 10mm uni.JPG  

 

 


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#2 dnrmilspec

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Posted 26 March 2021 - 05:31 PM

Beautiful.    What a treasure. 



#3 starman876

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Posted 26 March 2021 - 05:33 PM

Beautiful.    What a treasure. 

Thanks



#4 Russell Smith

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Posted 26 March 2021 - 06:07 PM

A treasure yes.

#5 Bomber Bob

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Posted 26 March 2021 - 06:13 PM

Johann, that was quite a coup!  Congratulations!  Can't wait to see it all set up.



#6 starman876

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Posted 26 March 2021 - 06:20 PM

Johann, that was quite a coup!  Congratulations!  Can't wait to see it all set up.

I need to modify a Unitron 152 mount because the Unitron 102mm rings are too small for the OTA.   So I figure I will adapt the mount to take a vixen rail.   The AVX mount will handle the tube, but it will not look right unless it is on a Unitron mount.


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#7 ccwemyss

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Posted 26 March 2021 - 06:46 PM

Very cool. Should be gorgeous when you're done. Not having had the opportunity to look at many 152 mounts, do the later ones have removable rings, or are they all fixed?

 

Chip W. 



#8 Dan /schechter

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Posted 26 March 2021 - 07:06 PM

Very cool. Should be gorgeous when you're done. Not having had the opportunity to look at many 152 mounts, do the later ones have removable rings, or are they all fixed?

 

Chip W. 

Congratulations Johan!!! Couldn't have gone to a more deserving home!!


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#9 starman876

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Posted 26 March 2021 - 07:50 PM

Very cool. Should be gorgeous when you're done. Not having had the opportunity to look at many 152 mounts, do the later ones have removable rings, or are they all fixed?

 

Chip W. 

Later mounts had removable cradles.  



#10 starman876

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Posted 26 March 2021 - 07:50 PM

Congratulations Johan!!! Couldn't have gone to a more deserving home!!

Thanks Dan.  Hope all is well with you.



#11 Defenderslideguitar

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Posted 26 March 2021 - 08:32 PM

Wonderful    It seems that Unitron telescope has found the most appropriate home

 

 

  sometimes  a scope finds youwaytogo.gif


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#12 Terra Nova

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Posted 26 March 2021 - 09:32 PM

The nice back-story and it’s one-off uniqueness are a double plus! Congratulations. I can’t wait to see it on a big Unitron GEM with the wooden tripod and accessory tray. A shiny black dewshield matching the one on the finder would look good too!


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#13 starman876

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Posted 26 March 2021 - 10:24 PM

The nice back-story and it’s one-off uniqueness are a double plus! Congratulations. I can’t wait to see it on a big Unitron GEM with the wooden tripod and accessory tray. A shiny black dewshield matching the one on the finder would look good too!

That is a good Idea Terra.  A black dewshield.   I have the mount in mind to put it on.  I will have to see if I can make it work.


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#14 photiost

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Posted 27 March 2021 - 04:41 AM

Yes that will really look good on a Unitron Mount.

 

Beautiful instrument.

 

Congrats !!



#15 starman876

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Posted 27 March 2021 - 08:58 AM

Yes that will really look good on a Unitron Mount.

 

Beautiful instrument.

 

Congrats !!

Thanks



#16 PawPaw

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Posted 27 March 2021 - 09:36 AM

Absolutely one of a kind.......Brass is awesome.



#17 starman876

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Posted 27 March 2021 - 09:53 AM

I have ordered a dual vixen/losmandy saddle plate for the mount.  That way I should be able to use the mount for other scopes.    Always wanted to use a large Unitron mount for various scopes.

 

https://optcorp.com/...unt-dusad-tk6g8


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#18 starman876

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Posted 27 March 2021 - 09:55 AM

Absolutely one of a kind.......Brass is awesome.

It has a nice patina finish which I will leave alone.  


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#19 starman876

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Posted 28 March 2021 - 07:47 AM

Looks like I need to put baffles in the tube.   I will use the distancing of the original Unitron F15 tubes.  Any suggestions on how to make the baffles?



#20 combatdad

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Posted 28 March 2021 - 07:52 AM

Nice acquisition, Johann!  Would look good at NEAF someday!!

 

Dave


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#21 starman876

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Posted 28 March 2021 - 08:27 AM

Nice acquisition, Johann!  Would look good at NEAF someday!!

 

Dave

Yes it would Dave.   Hope all is well with you and your family.  



#22 ccwemyss

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Posted 28 March 2021 - 02:42 PM

Looks like I need to put baffles in the tube.   I will use the distancing of the original Unitron F15 tubes.  Any suggestions on how to make the baffles?

When I redid the baffle in the 80mm f15 Jaegers, I used the technique of mounting the rings on thin dowels and sliding the whole assembly into the tube. The rings were made from thin plywood, like you can get at craft and hobby shops. The smaller holes were cut with a hole saw. For the largest, I drilled a series of holes, then carefully cut between them with a razor blade. Lined them all up and drilled three holes through all of them, near the edge, for the dowels, then glued it up with the proper spacing. It ended up a tiny bit warped, which gave it enough tension in the tube to stay in place. 

 

For the 6"f9, I'm planning to add some baffles this spring. It only came with two in the middle, each about 1/4" thick, doing double duty as baffles and reinforcement of the tube against pressure from the rings.

 

I have some 1/16" aluminum sheet, and plan to cut the holes with a fly cutter. At this point, I think I will cut the outside circumference with the bandsaw. I could directly glue them in place with JB Weld. But have been playing with the idea of making three small tabs on each, that bend at 90*. I would over-bend them in a bit for test fitting, then bend them out a bit to provide a little pressure for final placement. A dab of silicone glue under each would hold them. What I like about this is that if the rings are a hair under-sized, they will still have some mechanical force keeping them in place, and the tabs can flex with expansion and contraction. It would also be fairly easy to reverse. 

 

For the Jaegers, there was no way to reach into the tube. The 6" has a 7" tube, so it's easy to get into. A 4" tube would be a close call for one way or the other. 

 

Chip W. 


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#23 Bomber Bob

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Posted 28 March 2021 - 02:47 PM

Looks like I need to put baffles in the tube.   I will use the distancing of the original Unitron F15 tubes.  Any suggestions on how to make the baffles?

I'm gonna use the Edmund Method on my Jaegers 50:  cardboard tubes with black paper glued to the ends.

 

If I had your Unitron, I would have a local shop make a brass set -- thin sheet metal that the shop can punch-cut (disks with 4 tabs) with simple hole diameters (no 27.82mm stuff).


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#24 Terra Nova

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Posted 28 March 2021 - 02:51 PM

I'm gonna use the Edmund Method on my Jaegers 50:  cardboard tubes with black paper glued to the ends.

 

If I had your Unitron, I would have a local shop make a brass set -- thin sheet metal that the shop can punch-cut (disks with 4 tabs) with simple hole diameters (no 27.82mm stuff).

The 4” Edmund F15 refractors used card of baffles held in place by slide-in cardboard cylinders.


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#25 Bomber Bob

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Posted 28 March 2021 - 02:59 PM

The 4” Edmund F15 refractors used card of baffles held in place by slide-in cardboard cylinders.

That's what I'm referring to.  The black material wasn't paper, but it looked like paper -- the 2 mount bolts held them in place.

 

I removed the bolts on mine for standard tube rings; then, I flocked to keep the tubes positioned.


Edited by Bomber Bob, 28 March 2021 - 03:00 PM.

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