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Equipment Discussions >> Classic Telescopes

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starman876
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Zeiss Telementor
      #5507495 - 11/06/12 08:24 PM Attachment (88 downloads)

Thought you would all like to see a picture of one.

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Darren Drake
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Re: Zeiss Telementor new [Re: starman876]
      #5507501 - 11/06/12 08:29 PM

Cool. Napersky is gonna bring his out to my place sometime soon and I'm looking forward to looking through it.

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starman876
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Re: Zeiss Telementor new [Re: Darren Drake]
      #5507502 - 11/06/12 08:30 PM Attachment (65 downloads)

here is a close up

Edited by starman876 (11/06/12 08:31 PM)


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starman876
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Re: Zeiss Telementor new [Re: starman876]
      #5507509 - 11/06/12 08:37 PM Attachment (65 downloads)

Check out this picture of the lens and how it just about vanishes and this is shot at an angle. This was with a flash.

Edited by starman876 (11/06/12 08:38 PM)


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Adam S
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Re: Zeiss Telementor new [Re: starman876]
      #5507526 - 11/06/12 08:53 PM

It's a beauty, any idea as to it's age and how it compares with Japanese telescopes and mounts of the same era?

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starman876
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Re: Zeiss Telementor new [Re: Adam S]
      #5507535 - 11/06/12 09:00 PM

The optics on these are in a class of their own. The mounts are awesome and very precise to use. The peep sight for setting up on an object are a breeze to use. So simple that I am amzed they were not used more. These were built by Zeiss for schools to teach astronomy.

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starman876
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Re: Zeiss Telementor new [Re: starman876]
      #5507638 - 11/06/12 10:22 PM

http://www.google.com/search?q=zeiss+telementor&hl=en&tbo=u&tbm=i...

Look at this link of pictures of zeiss scopes.

when you click on more results the images are just amazing. This should keep most of you busy all night


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Copernicus1473
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Re: Zeiss Telementor new [Re: starman876]
      #5507962 - 11/07/12 06:25 AM

I am new to the refractor world. I have seen ads for Zeiss Telementor I and a Telementor II. What is the difference? Is one better than the other? Are the pictures posted of the Telementor I or II? Since these scopes are not APO is there much false color when looking at brighter objects?
Thank you from a newbie looking to buy a classic refractor.


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Sasa
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Re: Zeiss Telementor new [Re: starman876]
      #5507989 - 11/07/12 07:44 AM

Congratulation, this week I got Telementor as well. Originally, I was going to build a new OTA for the Zeiss C63/840 lens. But there was an opportunity to buy Telementor without the lens and I jump on it. I did not try it under the stars yet. The mount and its mechanics looks nice, I'm definitely curios how it will work under the stars.

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starman876
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Re: Zeiss Telementor new [Re: Sasa]
      #5508033 - 11/07/12 08:33 AM

That is a Telementor I. The difference is the focuser for one. The Telementor I has a helical focuser and the II is internal and moves the objective back and forth. Love those Germans for their eingineering and dedication to making high end optics.

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starman876
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Re: Zeiss Telementor new [Re: Sasa]
      #5508037 - 11/07/12 08:38 AM

which telementor OTA did you get. The lens fits inside the OTA in the first version that came out in the early 70's. The II version moves the lens assembly for focusing so is mounted very differntly. The Telementors that came out before both of these versions the lens actually screwed in and lens configuration was a flint foward assembly. The later Telementors are classic achromats. Can you post a picture of the lens?

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Copernicus1473
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Re: Zeiss Telementor new [Re: starman876]
      #5508038 - 11/07/12 08:40 AM

Thank you. Having never looked through on of these great scopes is there much false color when viewing brighter objects?

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starman876
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Re: Zeiss Telementor new [Re: Copernicus1473]
      #5508048 - 11/07/12 08:48 AM

To be honest I have not seen any color. This is a small high quality very smooth figure long focus lens so color should not be an issue. The first time used one I was looking at Jupiter and was amazed I could see such detail for such a small lens. And no violet haze.

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hpw
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Re: Zeiss Telementor new [Re: starman876]
      #5508341 - 11/07/12 01:10 PM

Congratulations! Always a pleasure to see one of these beautiful Telementors. Especially the later T-mount version with the red and white knobs.

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Mike E.
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Re: Zeiss Telementor new [Re: starman876]
      #5508354 - 11/07/12 01:17 PM Attachment (39 downloads)

Quote:

here is a close up




Hi Starman,

These are beautifully made scopes. My Wife and I were fortunate to acquire one reciently, however, have had little chance to use it with the bad weather here in the UK.

I notice in your photos that your mount doesn't seems to be supported all the way down on the tripod pintle. Our pintle is 2 3/4" long and fits into a 3" deep mount socket.

Here's a picture of ours for comparison.


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Sasa
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Re: Zeiss Telementor new [Re: starman876]
      #5508383 - 11/07/12 01:39 PM

Hello Starman876,

mine is Telementor II with internal focuser, the mount looks exactly like yours. I got the lens this summer from my friend. The OTA was very difficult to use:

http://www-hep2.fzu.cz/~kupco/astro/equipment/C63_840/C63_840.jpg

Still I had some fun with it, both on DSO (here) and planets:

http://www-hep2.fzu.cz/~kupco/astro/2012/2012_10_17/pic/orig/Jupiter_20121017...

The views through the lens were charming and it definitely deserved better OTA.


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starman876
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Re: Zeiss Telementor new [Re: Mike E.]
      #5508388 - 11/07/12 01:41 PM

I noticed that also. Will check into that tonight. maybe just needs a little cleaning..

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starman876
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Re: Zeiss Telementor new [Re: Sasa]
      #5508400 - 11/07/12 01:45 PM

If you look at the picture from Mike E that is a telementor II. I think you have a Telementor that dates before mine which places it before 1970.

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Mike E.
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Re: Zeiss Telementor new [Re: starman876]
      #5508441 - 11/07/12 02:20 PM

Quote:

If you look at the picture from Mike E that is a telementor II. I think you have a Telementor that dates before mine which places it before 1970.




The lady we purchased it from, said she bought it new from her local camera shop around 1980.


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Mike E.
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Re: Zeiss Telementor new [Re: starman876]
      #5508457 - 11/07/12 02:31 PM

Quote:

I noticed that also. Will check into that tonight. maybe just needs a little cleaning..




Inside the mount socket, there is a recess in front of the locking screw which has a metal plate in it. The screw pushes the plate against the pintle to lock it in position. Perhaps the plate is not backed far enough into its recess to allow the pintle to seat; its a close fit.


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starman876
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Re: Zeiss Telementor new [Re: Mike E.]
      #5508514 - 11/07/12 03:06 PM

Thanks, I will look at that tonight. I like the mount, however, it has been easier to grab the OTA and just use it for grab and go. I have a couple of these and I keep the mount and tripod packed up and stored.

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Sasa
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Re: Zeiss Telementor new [Re: starman876]
      #5508523 - 11/07/12 03:11 PM

Starman, my Telementor looks exactly the same as Mike's one. I was posting the image of original homemade OTA that came with the lens. I put the lens into the Telementor right now. Now I need only clear sky!

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starman876
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Re: Zeiss Telementor new [Re: Sasa]
      #5508537 - 11/07/12 03:25 PM

Sasa

OK. thanks for clearing that up. You had me confused.


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Mike E.
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Re: Zeiss Telementor new [Re: Sasa]
      #5508542 - 11/07/12 03:27 PM

Hello Sasa,

I like your sketches.


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Astrojensen
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Re: Zeiss Telementor new [Re: Sasa]
      #5508567 - 11/07/12 03:37 PM

Hello

The Zeiss Telementors were made from mid 1972, with a helical focuser, until around mid 1979, when they were replaced by the Telementor 2 (1979-1994), with the interior, crayford-style focuser, which only moves the objective. A very unique and brilliant design. Even very heavy accesories can be solidly attached to the rear end via the M44 threads. It has a bit more back focus than the Telementor 1. From around 1981, one could also buy the Telemator, which was a Telementor 2 with 7.5x42 finderscope and upgraded T mount (to model TM) with motor drive. These accesories could also be purchased separately, so one could upgrade older Telementors to motorized versions. The finderscope can be used on the Telementor 1, but doesn't fit well and is rather awkwardly placed on the helical focuser. It is primarily designed for the Telementor 2/Telemator.


Eighty years of Zeiss history. From right to left:
1910 Zeiss Reisefernrohr, 1972-79 Telementor, 1989 Telemator


The above image shows my three Zeiss 60mm's. The tripod on the 1910 Reisefernrohr is not original, but the Telementor and Telemator are 100% original. The Telementor doesn't have a tripod accesory plate/tripod brace, which is a major design flaw, IMO, since the legs can slip if the ground is slippery, from ice or such, and then the scope tips over. The OTA has a dent in the dewcap, so this has happened at least once in its past.

The C objective of the Telementor/Telemator series is a cemented achromat. Nothing fancy at all. I've seen two with a little astigmatism (one actually has quite a bit of it, it's the Telementor seen above) but the Telemator has a stunningly fantastic objective that will take 336x on double stars. What's scary is that the 1910 Zeiss is visibly better! I have since mounted a Zeiss dovetail on the Reisefernrohr, so that I can use it on my TM mount, which is a lot more stable than the original mount and has tracking to boot.



These are small scopes, for sure, but they have terrific optics, so they can show amazing things.


Clear skies!
Thomas, Denmark


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starman876
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Re: Zeiss Telementor new [Re: Astrojensen]
      #5508626 - 11/07/12 04:03 PM

Now that is a lovely scope. I love small wonders that provide big results. In the Washington DC area the seeing is really bad and these small 60mm scopes allow me to see things that normally in larger scopes look like wavy blobs. Everyone keeps telling me that aperture is everything. They must live were the sky is perfect.

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starman876
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Re: Zeiss Telementor new [Re: Mike E.]
      #5508630 - 11/07/12 04:06 PM

Those skethces are a clear example of what wonderful images these scopes will put up. I still remember the first night I used a Telementor. I was stunned. I have looked through a lot of 60mm scopes, but never one like this.

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Astrojensen
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Re: Zeiss Telementor new [Re: starman876]
      #5508663 - 11/07/12 04:24 PM

I used my Zeiss Telementor from 2004 until 2006 as my main deep-sky scope. The Telemator continued in that role until as late as 2010! I've seen hundreds of deep-sky objects with them. The Telemator, especially, has seen some ultra exotic objects (for a 60mm). I've made a few sketches at the eyepiece of the Telemator, though none of these are very exotic:


M1


M106


M101


M51 and NGC 5195


NGC 2903


NGC 4449


NGC 4490 and NGC 4485

Full image details can be found in my gallery: http://www.cloudynights.com/photopost/showgallery.php?ppuser=55742&cat=500


Clear skies!
Thomas, Denmark


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Sasa
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Re: Zeiss Telementor new [Re: Sasa]
      #5508759 - 11/07/12 05:27 PM

Quote:

Starman, my Telementor looks exactly the same as Mike's one. I was posting the image of original homemade OTA that came with the lens. I put the lens into the Telementor right now. Now I need only clear sky!




Well, I found out that I put the lens into the Telementor's OTA in wrong way. Unfortunately, my C63 lens does not fit into the OTA in its correct orientation... So now, I'm rather stacked.


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Astrojensen
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Re: Zeiss Telementor new [Re: Sasa]
      #5508772 - 11/07/12 05:42 PM

Quote:

Well, I found out that I put the lens into the Telementor's OTA in wrong way. Unfortunately, my C63 lens does not fit into the OTA in its correct orientation...




That sounds strange. Could you explain in a bit more detail why it doesn't fit?


Clear skies!
Thomas, Denmark


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Sasa
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Re: Zeiss Telementor new [Re: Astrojensen]
      #5508779 - 11/07/12 05:48 PM

There is no correct thread from the long side of the C63/840 cell. There is one but only very very shallow and the cell inner diameter is slightly smaller than the diameter of the outer thread on the Telementor sliding tube. My hypothesis is that my C63 is from Telementor I and was never threaded to match Telementor II system of lens attachment.

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starman876
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Re: Zeiss Telementor new [Re: Sasa]
      #5509016 - 11/07/12 08:51 PM

Can you provide a picture of the lens assembly?

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Copernicus1473
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Re: Zeiss Telementor new [Re: starman876]
      #5510138 - 11/08/12 03:34 PM

There is one of these great scopes for sale on Astromart. I am looking to get one. Any opinions on the condition and cost?

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Astrojensen
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Re: Zeiss Telementor new [Re: Copernicus1473]
      #5510147 - 11/08/12 03:44 PM

Can't see the price, as I am not an AM member, but it looks to be in fine condition. What's the price? (PM me, if it's against CN rules to do it here).


Clear skies!
Thomas, Denmark


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Mike E.
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Re: Zeiss Telementor new [Re: Astrojensen]
      #5510176 - 11/08/12 04:04 PM

APM Telescopes has used Telementors and Telemators etc. on its site under "second hand Zeiss products"

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Astrojensen
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Re: Zeiss Telementor new [Re: Mike E.]
      #5510190 - 11/08/12 04:09 PM

APM only has a Telemator for sale at the moment. A while back, he had six or seven Telementors and Telemators!


Clear skies!
Thomas, Denmark


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Mike E.
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Re: Zeiss Telementor new [Re: Astrojensen]
      #5510242 - 11/08/12 04:49 PM

Just took a quick cursory look at the site. There does seem to be a Telementor OTA available, and enough accessories to put together a working scope. Although other options exist, APM is a good source.

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starman876
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Re: Zeiss Telementor new [Re: Mike E.]
      #5510323 - 11/08/12 05:42 PM

The one on Astromart will cost a good deal to ship. Most likely three boxes It does appear to be a good deal if you live in Europe. . The ones on APM are pricy as a complete set up with mount, but are motorized so all you would need would be a converter. The Telementor II seems to be a good price, but will cost another $100 to ship to the USA. That would drive the price up beyond it's true worth. To be honest I only found one in the USA. All the others I have had were imported. I had to bite the bullet on the shipping costs. They just do not come up for sale in this country that often.

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SteveNH
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Re: Zeiss Telementor new [Re: Sasa]
      #5510424 - 11/08/12 07:25 PM

Quote:

There is no correct thread from the long side of the C63/840 cell. There is one but only very very shallow and the cell inner diameter is slightly smaller than the diameter of the outer thread on the Telementor sliding tube.



Sasa / or Thomas, I'm curious - are these Zeiss objectives permanently spun into their cells? Why can't you just remove the lens with a spanner wrench and flop it? - or am I missing something?
By the way, they ARE beautifully made scopes!

Edited by SteveNH (11/08/12 07:26 PM)


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starman876
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Re: Zeiss Telementor new [Re: SteveNH]
      #5510621 - 11/08/12 09:42 PM

The cell fits inside the OTA. It slides in and once in place on the Telementor I it is locked in place with set screws. The end of the OTA is the dew shield. In the Telementor II it screws into a cell that attaches to the internal focuser. They are not built like typica OTA where the cell just attaches to the end of the OTA.

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SteveNH
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Re: Zeiss Telementor new [Re: starman876]
      #5510736 - 11/08/12 10:43 PM

Thanks Starman876, that's what I surmised about the cell designs. But when I wrote "objectives", I actually meant the glass lenses themselves; not including the cell. My question is why the objective lens itself can't be removed from the cell, flipped around within it, and then mounted back into the OTA. (This would reverse the objective orientation without having to flip the cell around.) Are they spun into the cell?

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Darren Drake
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Re: Zeiss Telementor new [Re: SteveNH]
      #5510877 - 11/08/12 11:56 PM Attachment (21 downloads)

Napersky brought his Telementor out tonight. The star test was essentially perfect and the mount rock solid. We did have issues with the turret however. It is a type 1.

Edited by Darren Drake (11/08/12 11:57 PM)


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starman876
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Re: Zeiss Telementor new [Re: Darren Drake]
      #5510912 - 11/09/12 12:57 AM

I am not sure if a type I lens assembly can be mounted into a type II OTA. I think the lens cells are different.

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nightpilot
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Re: Zeiss Telementor new [Re: starman876]
      #5510977 - 11/09/12 02:29 AM

Is the Telementor 2 only a manually driven acope or is there a drive option? I have not been able to determine in my reading.

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Astrojensen
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Re: Zeiss Telementor new [Re: SteveNH]
      #5511022 - 11/09/12 04:07 AM

Quote:

But when I wrote "objectives", I actually meant the glass lenses themselves; not including the cell. My question is why the objective lens itself can't be removed from the cell, flipped around within it, and then mounted back into the OTA. (This would reverse the objective orientation without having to flip the cell around.) Are they spun into the cell?




The lenses are not spun into their cells; it is certainly possible to take them out of the cell or reverse them in the cell. It is even relatively risk-free to do this, as they are cemented objectives, so the lenses can't come apart and there are no foil spacers to fall out and get away.


Clear skies!
Thomas, Denmark


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Astrojensen
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Re: Zeiss Telementor new [Re: nightpilot]
      #5511025 - 11/09/12 04:19 AM

Quote:

Is the Telementor 2 only a manually driven acope or is there a drive option? I have not been able to determine in my reading.




The Telementor 1 and 2 are only manual. The Telemator has a motor drive. It is possible to upgrade the T mount of the Telementor 1 and 2 to the motorized TM mount of the Telemator. The conversion set is very difficult to find, however. It is much easier to find a complete TM mount, though even this can be considerably difficult and expensive. It is often much cheaper to just hunt down a complete Telemator instead of buying it piece for piece.

I have a Telemator, but rarely use the motor drive. It is just a 63mm scope after all, and I rarely use magnifications above 120x. The drive is exceptionally smooth and accurate, so if you wish to try webcamming or somesuch, it is worth getting - except for the fact that a modern mount with dual-axis drive and remote control is going to be vastly superior in this regard. And probably less expensive...

Zeiss is nice, but twice is the price.


Clear skies!
Thomas, Denmark


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Napersky
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Re: Zeiss Telementor new [Re: Astrojensen]
      #5511239 - 11/09/12 09:00 AM

I can't reach focus with Telementor 1 using a diagonal. I believe I need a shorter extension tube.

I've struggle with my turret since I bought it, somehow it's vignetted.

Mark


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starman876
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Re: Zeiss Telementor new [Re: Napersky]
      #5511311 - 11/09/12 09:45 AM

In the Telementor I use I took a 1.25" eyepiece adapter that screws into a normal 1.25" drawtube and took some aluminum tape and ran it around the threads. This built up the threads just enough to tightly screw it into the M44 helical foucser. Works like a charm with a 1.25" diagonal. I am sure that Baader makes an adapter that will do the same thing. I have never used an extension tube. I do have the M44 adapter to allow use of .965" eyepieces and then using a Unitron diagonal and either Zeiss eyepieces or Tak eyepieces also works great. I have never had a Zeiss turret, but I am sure the prism most likely is not a simple diagonal and adds extra length to the light path.

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Re: Zeiss Telementor new [Re: starman876]
      #5511489 - 11/09/12 11:51 AM

right on my guess is that possibly if I remove the extension tube and connect the eyepiece holder directly into the focuser and then use the diagonal it might be ok..it should work if yours does.

I looked at sales on A-Site of Telementors and man are they reasonable. I paid a bit too much for mine but I am very happy with the performance.


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starman876
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Re: Zeiss Telementor new [Re: Napersky]
      #5511509 - 11/09/12 12:06 PM

Well there is only one for sale on the A site and it is in Europe and the cost of shipping will bring it right up there in cost. On the APM web site they are real proud of the Zeiss products.

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nightpilot
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Re: Zeiss Telementor new [Re: Astrojensen]
      #5511538 - 11/09/12 12:23 PM

Thanks so much for the information.

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Re: Zeiss Telementor new [Re: Astrojensen]
      #5511676 - 11/09/12 01:30 PM

Quote:

The lenses are not spun into their cells; it is certainly possible to take them out of the cell or reverse them in the cell. It is even relatively risk-free to do this, as they are cemented objectives, so the lenses can't come apart and there are no foil spacers to fall out and get away.


Clear skies!
Thomas, Denmark



Thank you Thomas! I hope Sasa can try this out.


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Re: Zeiss Telementor new [Re: Napersky]
      #5511737 - 11/09/12 02:10 PM

Quote:

connect the eyepiece holder directly into the focuser and then use the diagonal it might be ok.




This is how I do it on my Telementor 1 and the Telemator. It works just fine. My M44/1.25" adapter is about 40mm long and the 1.25" diagonal is a run-of-the-mill Taiwanese unit. I do have to turn the focuser almost all the way out, so there is room for a longer adapter or a bigger prism.



Here you can see it in action on the Telemator. There is a 20mm extension between the finderscope and the M44/1.25" adapter. The Telemator/Telementor 2 has more back focus than the Telementor 1.


Clear skies!
Thomas, Denmark


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Re: Zeiss Telementor new [Re: Napersky]
      #5511743 - 11/09/12 02:13 PM

Quote:

I've struggle with my turret since I bought it, somehow it's vignetted.




What model turret is it? The amici prism version (three 24.5mm holders and one M44) or the older mirror diagonal type (four 24.5mm holders and one M44)?


Clear skies!
Thomas, Denmark


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Re: Zeiss Telementor new [Re: Astrojensen]
      #5511823 - 11/09/12 03:03 PM

That is a beautiful telescope. I have been thinking of buying the TM1 mount. However, then I need to build a frequency converter to work with the 50Hz. I also want to get the tray. That looks really nice.

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Re: Zeiss Telementor new [Re: starman876]
      #5511888 - 11/09/12 03:44 PM

No, no, not "TM1", just "TM". There's a company here in Europe that converts TM and 1b mounts to 12v stepper drive. I'll see if I can find their adress again, if it has any interest.

The tray only fits the tripods it's made for. There needs to be a small extension to the lower tripod clamp with a small setscrew on it. Otherwise the tray won't fit. The old Telementor 1 tripods don't accept the trays.


Clear skies!
Thomas, Denmark


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Re: Zeiss Telementor new [Re: Astrojensen]
      #5511946 - 11/09/12 04:26 PM

So let me get this correct. It is TM not TM1. I want to be absolutely sure I am doing this right

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Re: Zeiss Telementor new [Re: starman876]
      #5511948 - 11/09/12 04:28 PM

Good old american engineering can modify anything with a big enough hammer to make it fit

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Re: Zeiss Telementor new [Re: starman876]
      #5511957 - 11/09/12 04:36 PM

Quote:

It is TM not TM1




Yes. Just TM. The one without motor is just T.

Quote:

Good old american engineering can modify anything with a big enough hammer to make it fit




The blacksmith school of telescope making, eh? Sure, as long as you don't need to take it apart later... Or adjust it. Though I guess that can be taken care of with the hammer as well.


Clear skies!
Thomas, Denmark


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Re: Zeiss Telementor new [Re: Astrojensen]
      #5511972 - 11/09/12 04:52 PM

My first telescope was made with a 6" carpet tube, some PVC tubing for the focuser and some lenses from Edmunds. I was 11 years old and made my first and only 5" F15 refractor. I remember going down to the carpet store with my Radio Flyer wagon and getting the carpet tube. To keep the lens in the tube I used a large lid from a canning jar. It actually worked really well. A clothes line was my mount and sometimes a tree limb and sometimes the top of the car or a fence. The lenses I got from my neighbor who was an astronomer. Never used a hammer. Wish I knew what happened to those lenses.

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Re: Zeiss Telementor new [Re: starman876]
      #5511983 - 11/09/12 05:09 PM

Thomas,

I don't know that I even have a model number markings on my Turret.

On page 12 of this pdf:

http://geogdata.csun.edu/~voltaire/classics/zeiss/zeissjena3photos.pdf

Mine is silver not black.


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Re: Zeiss Telementor new [Re: Napersky]
      #5511994 - 11/09/12 05:16 PM

It's the amici prism version all right. Same as mine, except mine is the newer, black version.

Now, how does the vignetting look like? Is it off-axis, vignetting one side of the field of view?


Clear skies!
Thomas, Denmark


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Re: Zeiss Telementor new [Re: starman876]
      #5512003 - 11/09/12 05:20 PM Attachment (18 downloads)

Quote:

That is a beautiful telescope. I have been thinking of buying the TM1 mount. However, then I need to build a frequency converter to work with the 50Hz. I also want to get the tray. That looks really nice.




The tray is nice, however I would have preferred it to have captive holes for the thumbscrews, instead of slots. When assembling, I find I must carefully tighten the screws with the tristand upside down, so that the legs self center themselves with equal tension, or the tray has a tendency to pop out of one or more of the slots. At the moment I am using chains for the spreader, until I can machine a shallow countersink at the top of the slots for the screwheads to lock into.

Not sure if anyone else has had this issue ?


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Re: Zeiss Telementor new [Re: Mike E.]
      #5512011 - 11/09/12 05:24 PM

Now that looks like the tray can be made to attach to the Telementor I mount without very much trouble. I can hammer out that tray in an afternoon. Let me fire up the coals

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Re: Zeiss Telementor new [Re: Mike E.]
      #5512023 - 11/09/12 05:31 PM

Quote:

Not sure if anyone else has had this issue ?




What would make you think I didn't...?

Seriously, not just using holes, istead of the slots, is a major design flaw, IMO.


Clear skies!
Thomas, Denmark


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Re: Zeiss Telementor new [Re: Astrojensen]
      #5512043 - 11/09/12 05:45 PM

Quote:

It's the amici prism version all right. Same as mine, except mine is the newer, black version.

Now, how does the vignetting look like? Is it off-axis, vignetting one side of the field of view?


Clear skies!
Thomas, Denmark




This was mentioned on the Yahoo Telementor site.
I also noticed this off axis issue in our turret. In our case the problem lies in the alignment of one of the plastic eyepiece holders. When one of the other holders was placed in the same location, it centered in the field, and could easily be seen by looking through from the objective end.


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Re: Zeiss Telementor new [Re: SteveNH]
      #5512083 - 11/09/12 06:08 PM

Quote:


Thank you Thomas! I hope Sasa can try this out.



Thanks for your help, I was aware of this posibility. Apart mooving focus by 6cm, the biggest problem is that the thread fitting the inside moving tube is on the ring which is pushing the lens.


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Re: Zeiss Telementor new [Re: Astrojensen]
      #5696408 - 02/23/13 11:26 AM

Quote:

The Telementor doesn't have a tripod accesory plate/tripod brace, which is a major design flaw, IMO, since the legs can slip if the ground is slippery, from ice or such, and then the scope tips over. The OTA has a dent in the dewcap, so this has happened at least once in its past.




I have definitely noted this deficiency with regard to the lack of leg bracing and am intending to add a strong metal spreader. It's a vintage, adjustable Edmund spreader that I have had for many years and can certainly be put to use here. Another flaw that I have noted in the mount is the lack of an easily removable "keeper" at the bottom of the counter weight bar. Mine has a semi- permanent small collar at the bottom of the bar and so the bar has to be screwed and unscrewed into the Dec shaft every time I want to remove the weight. I am afraid that I will strip the threads doing this because it is so heavy so I am going to remove the collar, drill and tap a hole in the bottom of the bar and add a steel washer and black Bakelite knob that is the same as the one on the spreader I am going to install. I'll do this in the shop later next week and post pictures when completed.


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Re: Zeiss Telementor new [Re: terraclarke]
      #5696431 - 02/23/13 11:40 AM

Oh oh

so will this be a frankentelmentor in the end


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Re: Zeiss Telementor new [Re: terraclarke]
      #5696437 - 02/23/13 11:43 AM

Good ideas, Terra. There are plenty of these scopes around, so a little gentle modifications like these just add to the charm. Don't think too much of the collector's value and such. These scopes are keepers, not something you buy as an investment, but something to use as often as possible.

While I have both a 6" refractor and a 12" dob, I still take my Telemator out for a swing every so often.


Clear skies!
Thomas, Denmark


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Re: Zeiss Telementor new [Re: Astrojensen]
      #5696606 - 02/23/13 01:27 PM Attachment (11 downloads)

I agree with you Thomas. When I got this scope I got it to be used as a working telescope rather than a museum piece. There are a few things that need fixing to make it so. I am doing them very lightly so as to preserve the original integrity of the scope as much as possible. The removable hinged ring to mounting a rotatable finder scope is one such modification. It does nothing permanent to the scope but for me, it makes it more usable. I have just finished replacing the leather leg tether by adding the metal spreader. The leather is preserved in a box, the spreader is attached to the same holes in the metal tripod leg brackets using the same screws. It is of similar vintage as the scope itself and now the telescope is much more stable and I don't have to worry about collapsing it with the telescope on it- a potential disaster has thus been averted. The change I make to the counterweight bar will be permanent, but subtle and again, make the scope more useful to me and avert another more serious problem- harming the threads on the counter weight bar. Here is a picture of the newly attached leg spreader.

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Re: Zeiss Telementor new [Re: terraclarke]
      #5696620 - 02/23/13 01:35 PM Attachment (12 downloads)

Here is the keeper that I plan to add to the base of the counter-weight shaft to make the weight easily removable and preserve the threads on the shaft itself. Note that is exactly the same kind of knob as is on the spreader.

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Re: Zeiss Telementor new [Re: terraclarke]
      #5697077 - 02/23/13 06:30 PM

or you simply unscrew the dovetail from the bottom of the scope. Screw on a vixen dovetail and use it on any mount you want. I have done this one several Telementors and it works great.

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Re: Zeiss Telementor new [Re: starman876]
      #5697159 - 02/23/13 07:30 PM

Does it just unscrew? The tube is threaded? I don't want to mess with reattaching nuts inside of the tube.

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Re: Zeiss Telementor new [Re: terraclarke]
      #5697206 - 02/23/13 08:01 PM

Johann, I love the Telementor mount and prefer to use the scope with it. I just want to be able to take off the counter weight when I move the telescope.

Terra


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starman876
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Re: Zeiss Telementor new [Re: terraclarke]
      #5697606 - 02/24/13 12:00 AM

The tube is threaded it just unscrews

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Re: Zeiss Telementor new [Re: terraclarke]
      #5697737 - 02/24/13 03:08 AM

Quote:

... keeper that I plan to add to the base of the counter-weight shaft to make the weight easily removable




My habit is to setup the Telementor in 3 steps : (1) tripod and levelling, (2) EQ-mount and rough polar alignment and (3) OTA and balancing.

Thus I minimise the chance of causing damage to both telescope and chandeliers (& such). Besides this way I always keep the counterweight on the DEC axis; In your design Terra - adding a knob to the bottom of the bar - you will loose ~3cm travel of the counterweight on the DEC axis (which might not be a problem, and should you need more counterweight, you can of course always add another/a bigger one )

Allan

PS: Nice solution with the spreader for the T1 legs !

Edited by AllanDystrup (02/24/13 03:11 AM)


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Astrojensen
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Re: Zeiss Telementor new [Re: AllanDystrup]
      #5697765 - 02/24/13 03:54 AM

My Telemator setup process:

1) Pick up fully assembled Telemator

2) carry outside and plunk down where you want to observe from

3) eyeball polar alignment

4) Observe!

Reverse process at end of observing session. Don't forget to hug or pet it, before taking it inside.


Clear skies!
Thomas, Denmark

Edited by Astrojensen (02/24/13 03:56 AM)


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AllanDystrup
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Re: Zeiss Telementor new [Re: Astrojensen]
      #5697791 - 02/24/13 05:22 AM

Yep, tried that Thomas, but I always ended up banging into something along the way from my office thru' the kitchen & living room, out the narrow door and over the small bridge across the garden pond to the rear garden...

Believe me, I would use your algorithm, if I had more space in my living room + a wide terasse door

Edited by AllanDystrup (02/24/13 05:24 AM)


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Re: Zeiss Telementor new [Re: AllanDystrup]
      #5697948 - 02/24/13 09:46 AM

Allan, your three step setup process will definitely be adopted my me. Thomas, for me, the Zeiss all set up is just too unwieldy to carry in one piece from inside to outside. However, with the new spreader that I have installed, the whole scope is very easily moved from one location to another on the deck. Before the spreader, any movement of the scope scared the heck out of me because the legs would want to go everywhere causing the scope to potentially fall over. It is now very solid.

Thanks for the tip Allan about the keeper making the counter weight not have enough travel. I will have to consider that and will put off that modification until I see how the telescope balances with the new finder I have ordered for my finder scope ring. It's the Stellarvue 50 mm helical focus and it and the ring add about 2 pounds to the total weight. Also, when I get my 1.25 inch adapter my Baader prism diagonal and my larger Vixen LV eyepieces will also add to the weight.

Another non-invasive option would be to keep the mount completely assembled with the weight on and no alteration of the c.w. shaft, and keep the mount in a sturdy wooden carry cabinet, until I place it on the tripod in step 2 of your setup algorithm. I have just such a cabinet that would be perfect for the job after making a few inserts to hold the mount in place.


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Re: Zeiss Telementor new [Re: terraclarke]
      #5698062 - 02/24/13 10:59 AM

I just leave mine outside covered with a tarp. Makes it so much easier.

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estwing
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Re: Zeiss Telementor new [Re: starman876]
      #5698112 - 02/24/13 11:27 AM

mine spent 15yrs in attic!...wasted youth.

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Re: Zeiss Telementor new [Re: terraclarke]
      #5698270 - 02/24/13 01:27 PM Attachment (5 downloads)

Quote:

...keep the mount completely assembled with the weight on and no alteration of the c.w. shaft, and keep the mount in a sturdy wooden carry cabinet




Yep, definitely an option; For inspiration a pic. (below) of the box used by Zeiss to deliver the T2.

Allan


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estwing
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Re: Zeiss Telementor new [Re: AllanDystrup]
      #5698287 - 02/24/13 01:39 PM

my box is at the ex-wife's house never had the face to ask for it back!

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Re: Zeiss Telementor new [Re: estwing]
      #5699968 - 02/25/13 02:45 PM

I've left the counter-weight shaft alone and found that by setting the mount up as an alt-azimuth by loosening the hex nut and bringing the dec shaft to horizontal, the counter-weight can be left on the shaft, slid flush to the housing and locked and now the weight is shifted to the center which makes the whole unit, tripod and attached mount much easier for me to balance and carry. Problem solved with such a simple and practical solution. The mount also works wonderfully as an alt-azimuth mount with slow motions when set up in this way. It is very stable and easy to use.

I can't over how much heavier this set up is in comparison to either my 60mm eq. Unitron or my 60mm eq. Monolux, yet in this configuration it is still a wonderful grab and go and within minutes can be moved and set up on the deck for viewing. For breakdown, the tripod and mount remain assembled, and the tube goes into a soft, padded carry bag. Very handy yet very capable.


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