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old zeiss 70/700 objective - info wanted

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#1 kjkociba

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Posted 06 June 2022 - 11:21 AM

I know it's a long shot,  but by chance has anyone ever run across an early zeiss 70mm X 70CM?    I picked up a bare objective, NR - 14544, Cell is identical to the early astro lenes, but it doesn't have any OBJ - type marked, (AS, A, B, etc).  Lens is foil spaced, fairly thin glass, and after I made a temporary OTA, (Dont laugh, good old cardboard), gives pretty good views, tad of false color, not surprising with f/10, with stars are nice dots through field edge, with slightly off center but round airy disks probably due to nature of the OTA not being optically true.  looking through old zeiss catalogues I have access to, I can find no mention of this FL combo.    Here's a pic of the lens in cell.    Now I wish that I had picked up the old zeiss cadaver I saw on ebay a year and a half ago.  but alas, hindsight truly is 20/20.

 

 

Any info would be appreciated, and will probably email Zeiss if I don't find any public info on it.

 

zeiss 70mm
Album: zeiss 70CM F/10
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#2 Astrojensen

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Posted 06 June 2022 - 11:36 AM

Unusual! Never seen one before. Zeiss made a lot of one-offs, though. Could make for a superb little grab and go. 

 

 

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Thomas, Denmark



#3 Terra Nova

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Posted 06 June 2022 - 11:37 AM

I know it's a long shot,  but by chance has anyone ever run across an early zeiss 70mm X 70CM?    I picked up a bare objective, NR - 14544, Cell is identical to the early astro lenes, but it doesn't have any OBJ - type marked, (AS, A, B, etc).  Lens is foil spaced, fairly thin glass, and after I made a temporary OTA, (Dont laugh, good old cardboard), gives pretty good views, tad of false color, not surprising with f/10, with stars are nice dots through field edge, with slightly off center but round airy disks probably due to nature of the OTA not being optically true.  looking through old zeiss catalogues I have access to, I can find no mention of this FL combo.    Here's a pic of the lens in cell.    Now I wish that I had picked up the old zeiss cadaver I saw on ebay a year and a half ago.  but alas, hindsight truly is 20/20.

 

 

Any info would be appreciated, and will probably email Zeiss if I don't find any public info on it.

 

I wonder if it could be part of an old military telescope or spotter, like a quartermasters telescope, or maybe an artillery spotter.


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#4 Astrojensen

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Posted 06 June 2022 - 11:45 AM

I wonder if it could be part of an old military telescope or spotter, like a quartermasters telescope, or maybe an artillery spotter.

It's not impossible, but they usually had very different lens cells. This looks like a genuine astro objective. It could have been from a finderscope for a larger scope. Maybe someone with the Diarium could look it up, if the serialnumber is not too high. 

 

 

Clear skies!

Thomas, Denmark


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#5 kjkociba

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Posted 06 June 2022 - 11:50 AM

Exactly!  and is the main reason I picked it up, most of the oddball zeiss lens cells  for terrestrials that I've seen look more like a front element from a camera lens (diatar, tessar, etc)



#6 kjkociba

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Posted 08 June 2022 - 10:54 AM

serial # is right towards the end of the missing section of the zeiss online archives,  Oh well. It will be a great portable rig after I build a period tube!



#7 Dave Trott

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Posted 08 June 2022 - 04:03 PM

Good plan! Maybe you can find a nifty Zeiss focuser. Very fun project!


Edited by Dave Trott, 08 June 2022 - 07:57 PM.


#8 kjkociba

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Posted 08 June 2022 - 04:57 PM

Chuckle. It was a thought! I have been put in touch with a wonderful brass focuser that will work just fine (thank you, you know who you are) Although not a zeiss, it looks the period. I actually prefer it that way as this isn’t a restoration. Zeiss focusers seem to be rarer than the glass, and are rather well documented, I would rather a serialized focuser be found and used by someone with the matching objective size. Hope that makes at least some sense.
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#9 kjkociba

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Posted 12 June 2022 - 07:42 PM

Ok. After a brief design phase based upon what I had in the parts bin,  acquiring a focuser (thank you again!),  fixing said focuser (sorry again) machining a cell holder and assembling, here’s the naked OTA!  Had to trim down the ota once to accommodate the diag. It focuses all my EP’s both with diag and drawtube.

018247F7 350C 4969 9B65 EEB1BF26A0A8
7D5AD1B8 0439 4F5C 8FB8 4511785207C3
324244FB 16DE 4D20 894E C0DAB05F3F2E
F2F526CB 9306 40E1 BC70 B2B98E9F2584

 


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#10 Dave Trott

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Posted 12 June 2022 - 08:50 PM

This is well on it's way to being a first class resto-mod! Looking great!!



#11 kjkociba

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Posted 13 June 2022 - 02:17 PM

resto-mod. I like it!  Fitting as I have been unable to find another example to base a rebody restore on!  



#12 Astrojensen

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Posted 13 June 2022 - 03:01 PM

Hey, that doesn't look half bad! What mount is that? Can't quite recall having seen one like that before.

 

 

Clear skies!

Thomas, Denmark



#13 kjkociba

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Posted 13 June 2022 - 03:35 PM

Thanks! The EQ mount, I believe, is an old anchor/ Edmond head that I had without a declination shaft/ mount plate. I machined a new one to fit my old refractor (bardou) It has 2 bolts through the OTA at center of balance that I was always worried I would loose or damage the internal plates taking them out to fit modern clamshells/rings. This OTA is temporarily held on using high tech hose claps until I get the balance right. Setting circles are from the parts bin.
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#14 kjkociba

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Posted 14 June 2022 - 10:41 AM

Now with my antique finder scope…  plan is to varnish my brass cell to match the finders cell and OTA focuser. Jury is out with how to finish the main tube…

 

4649DA3E 5F33 48C0 AC13 5A65A47AECCA
B7BD1FCA 2DD8 434A A42A BDF28F6FF201
6B4EF753 D7F2 498E 80F4 D902CFCF00C6

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#15 Dave Trott

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Posted 14 June 2022 - 03:59 PM

You could keep it the way it is right now with the hose clamps and the somewhat decrepit appearance. It would be a sort of Rat-Rod telescope. Rough looking but highly functional. Cool if you ask me. 


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#16 kjkociba

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Posted 14 June 2022 - 05:03 PM

Possibility :) … Rat rod 70/700… astronomical version of a new frame model T with an original Offenhauser?
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#17 kjkociba

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Posted 21 June 2022 - 06:14 AM

Well, after much consideration, decided to give the main OTA a coat of off white paint, and affix mounting bolts. Although the hose clamps had a certain charm, was a pain to balance it out for different tail accessories.  pretty happy with it optically, after recentering the tail, and truing the objective side tube face, I have well defined airy disks using my 8mm brandon!

 

B70300FA 59B2 4D9D 8780 1C15D95E6441
67C09FCA EE17 4FAB 96D2 51D4C383A155
5BC35CF0 4AFE 4987 A295 4ED153D0EB04

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#18 Dave Trott

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Posted 21 June 2022 - 11:40 PM

WOW!! That is pure class!!



#19 oceanoprofondo7

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Posted Yesterday, 04:15 PM

Top class!!!


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