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Anyone knows this eyepiece? Old 17mm Köhler Panoptic

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#1 Nebula27

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Posted 12 January 2019 - 04:33 AM

So a few days ago this eyepiece popped up, and I was curious about what it is worth and the quility. The design is a Köhler Panoptic wich is not from televue. It is a 17mm panoptic wich seems pretty old. On the image it states 68°, but in the design description on the same website it states about only 30°. Anyone owns this eyepiece or knows anything about it? 

 

Here is a site with some information wich you can find in the 20th century part. Below are some pictures of the eyepiece and of the design.

Attached Thumbnails

  • 20190112_102052.jpg
  • 20190112_102453.jpg

Edited by Nebula27, 12 January 2019 - 04:35 AM.


#2 SomebodyElseEntirely

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Posted 12 January 2019 - 05:32 AM

This looks like the 17.5mm LOMO Bertele. It is a microscope eyepiece repurposed for astronomy (the 32mm barrel has been turned to 31.7mm, as attested by the bare aluminium).

 

It is possible to still buy these new. They are not worth very much. It is interesting to see that its sister eyepiece, the 30.6mm Keller, usually sells for more, despite the fact that the 17.5mm eyepiece is optically more complex and has a much wider field. But, then again, that Kellner is a very nice eyepiece.



#3 Nebula27

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Posted 12 January 2019 - 07:32 AM

This looks like the 17.5mm LOMO Bertele. It is a microscope eyepiece repurposed for astronomy (the 32mm barrel has been turned to 31.7mm, as attested by the bare aluminium).

It is possible to still buy these new. They are not worth very much. It is interesting to see that its sister eyepiece, the 30.6mm Keller, usually sells for more, despite the fact that the 17.5mm eyepiece is optically more complex and has a much wider field. But, then again, that Kellner is a very nice eyepiece.

Yea, they look exactly the same as the LOMO 17.5mm. I thought it would maybe be a televue panoptic clone of almost the same performance. Thanks for your help!

Edited by Nebula27, 12 January 2019 - 07:33 AM.


#4 stevep

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Posted 12 January 2019 - 07:54 AM

Yes looks like the Lomo 14x eyepiece, same eyepiece as the Intes Bertele, I haveone and have also had the Intes version,

in which case your design picture is not correct,mod bertele.jpg bertele 14x.JPG bertele 14x design.JPG



#5 Vla

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Posted 12 January 2019 - 09:11 AM

I'm not aware of such thing as Koehler Panoptic. The original take on the configuration is known as Zeiss (Koehler) Erfle, while Panoptic is the final Al Nagler's take on it (the first one was patented in 1985 as "wide angle eyepiece", #4,525,035). Seemingly very similar configurations of this type can have significantly different performance level.




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