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#1 dalbaugh

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Posted 20 August 2021 - 10:02 PM

i rescued this scope today and it looks like a cave. However I can not find and markings on the mirror. It has been sitting outside for 2 decades,
I was told it came form Valparaiso University. The secondary has no coatings left, however the primary is useable.
Has a Novak primary holder also found a eyepiece inside of it that I can not identify. 12.5 primacy 2.5 secondary.
definitely cave 2" focuser any help would be great

dan albaugh

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#2 deepwoods1

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Posted 20 August 2021 - 10:50 PM

This was sad…..



#3 rachnoman

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Posted 20 August 2021 - 10:58 PM

dan,

 

The eyepiece appears to be like the one I had which was a 30mm military surplus unit.

The scope looks like around F/6.

The mount looks homemade.

 

It is my guess the students in the Astronomy department at the University built this scope a long time ago. Have never seen this scope at any gatherings and I have been living in Valparaiso since 1993.

 

Glad you rescued that poor scope.

 

dave,


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#4 MisterDan

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Posted 20 August 2021 - 11:28 PM

This image appears to have another sample of the same "core" eyepiece...

 

https://assets.newat...-eyepiece-7.jpg

 

Perhaps a long Kellner?...

 

Best wishes.

Dan


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#5 rachnoman

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Posted 21 August 2021 - 02:12 AM

I believe it's some kind of Erfle design for it's wide field of view.



#6 Stevegeo

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Posted 21 August 2021 - 04:00 AM

Good find, and rescue.... let's hope you can bring it back to life.

 I would at least,   such a shame to be discarded like that...



#7 CHASLX200

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Posted 21 August 2021 - 06:14 AM

That maybe the way my 10" RG looks soon. Looks like a old school OTA with a Parks tube. Starliner used a band as seen on that tube so could be a Starliner OTA. Focuser is the same that is on my 10" RG around 1980.  That focuser was used by many makers.  I can't see the mount good so can't help.



#8 CeeKay

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Posted 21 August 2021 - 06:43 AM

This was sad…..

More like criminal... breaks my heart to see how some telescopes have been treated.



#9 Terra Nova

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Posted 21 August 2021 - 07:11 AM

The eyepiece is an Edmund war surplus optic, more precisely it is a wide field Kellner, salvaged from WWII AA gunsights. I have one and I love it. I got my first one of them from Edmund in 1967.

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Edited by Terra Nova, 21 August 2021 - 07:14 AM.

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#10 Terra Nova

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Posted 21 August 2021 - 07:16 AM

Here it is in the catalog:

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#11 CHASLX200

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Posted 21 August 2021 - 07:55 AM

The eyepiece is an Edmund war surplus optic, more precisely it is a wide field Kellner, salvaged from WWII AA gunsights. I have one and I love it. I got my first one of them from Edmund in 1967.

Looks like the same that was in my 50mm Edmund finder.
 



#12 apfever

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Posted 21 August 2021 - 08:05 AM

Dan,

 

The entire scope is likely an ATM (amateur telescope maker) project. The OTA (optical tube assembly) might be manufactured, but is more likely an ATM considering the big picture. 

The mount was too difficult to see, so I cropped and enlarged your picture. Click on the picture to enlarge more. This is definately an ATM mount, or even a step down to homey made. Nice looking primary but extremely thick old school. How thick is it?

The tube is full blown fiberglass, not a paper wind, which was common ATM stuff wayyy back in the day. It probably won't take much to refurbish the OTA to a very nice status. The mount might be questionable.

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Edited by apfever, 21 August 2021 - 08:07 AM.

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#13 Terra Nova

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Posted 21 August 2021 - 09:52 AM

Looks like the same that was in my 50mm Edmund finder.
 

Yep, they used them in construction of their big deluxe finder. They’re great as eyepieces. I think of them as the original spacewalk eyepiece before the 28mm RKE. The eyelens and the field lens are huge, and both are doublets. I think the design is a reverse Kellner tho Edmund described them as Kellners. The brass housing is quite heavy and with a couple of turns of aluminum insulating tape they will fit in a 2” diagonal or focuser.


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#14 dalbaugh

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Posted 21 August 2021 - 10:09 AM

Eye piece solved, Ro answer a few questions left mount it was home made by the owner from pipe. The owner had passed away 10 years ago and his wife told me he purchased from Valparaiso University 30 years ago and it had been in that spot since purchase. She said it was his pride and joy.
I first thought it was a cave because of the end rings on the tube, the silver a foot from the ends is reflective tape. The mirror is a full 2 inch and the cell is an old Ken Novak. The only markings I could find on the mirror is 76.3 engraved in the side. The tube is heavy fiberglass and will look new once I re Ge coat the tube.
Not sure when I will get to it, I purchased another project to restore ( 10"Cave Dall Cass) I just could not leave it siting. Since it appears to be built and not a commercial scope I will not feel so bad make some updates.
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#15 dalbaugh

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Posted 12 September 2021 - 12:57 AM

received word back from University the scope came from. scope was a build form parts on hand. Optical craftsman tube, Cave mirrors Meade focuser. Mirror does not say Cave optical but has the number M 692. Now i need to decide what to do with it. Tube is an easy restore never painted so a fresh gel coat will be easy.

However the scope is a monster, in no way is it portable. Maybe build dob or sale. Not sure I have the time for another project. In the middle of a restoration on a mid fifty's Cave Dall Kirkham.

Edited by dalbaugh, 12 September 2021 - 12:59 AM.

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#16 sdedalus83

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Posted 12 September 2021 - 02:25 AM

Yep, they used them in construction of their big deluxe finder. They’re great as eyepieces. I think of them as the original spacewalk eyepiece before the 28mm RKE. The eyelens and the field lens are huge, and both are doublets. I think the design is a reverse Kellner tho Edmund described them as Kellners. The brass housing is quite heavy and with a couple of turns of aluminum insulating tape they will fit in a 2” diagonal or focuser.

Isn’t that a true Plossl, two cemented doublets with a larger field lens?



#17 Terra Nova

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Posted 12 September 2021 - 10:11 AM

Isn’t that a true Plossl, two cemented doublets with a larger field lens?

I’ve never had one apart myself but variants do seem to cloud the issue of the true classification of that eyepiece’s design. Another factor to consider, other than the actual number of lens elements and their combination is also the curvature of the surfaces and the relative size of the eyelens and field lens components. Here are four basic designs that seem most closely related to what this eyepiece has been called. All I know is that Edmund referred to it as a Kellner. Somewhere, I have a PDF of the original patent squirreled away. I need to try and find it.

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#18 clamchip

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Posted 12 September 2021 - 10:29 AM

If its like most of the other surplus gun sight eyepieces Edmund sold it

is known as a Type III Kellner. We call this design a Plossl today.

Two cemented achromats.

 

Robert


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