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Obscure question re; microscope eyepieces

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#1 RichA

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Posted 20 September 2021 - 06:48 PM

Where any of the Zeiss Opmi eyepieces Abbe orthos?

 



#2 Highburymark

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Posted 20 September 2021 - 08:30 PM

Your best bet is to look on eBay - they do come up for sale quite regularly from suppliers dealing in microscope optics. The trick is to find examples in good condition.

#3 Astrojensen

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Posted 20 September 2021 - 11:49 PM

I don't think so. The ones I've seen have all been 1-2-1 Königs. 

 

 

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Thomas, Denmark


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#4 RichA

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Posted 21 September 2021 - 02:20 AM

I don't think so. The ones I've seen have all been 1-2-1 Königs. 

 

 

Clear skies!

Thomas, Denmark

Yes, the only microscope eyepiece I found that incorporated a triplet lens (not Abbe) was made by Olympus.



#5 j.gardavsky

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Posted 21 September 2021 - 10:49 AM

The only microscope eyepiece employing the Abbe ortho (field stop - 3 -1) design I have in my collection, is the Carl Zeiss Jena PK (planar and compensating).

The compensation has been required for the Abbe-type apochromatic microscope objectives, to correct the magnification difference between the short and long wavelengths of light - CVD correction.

 

These CZJ PK Abbe orthos are not particularly well suited for the astronomy telescopes.

 

The Abbe orthos have been mostly abandomed from the microscopy, and replaced by the different variations of the König designs.

 

One of the König designs (field stop - 2 - 1) as also used in the microscopy, is available from Edmund Optics under the name RKE, and it enjoys a very high acceptance among the hobby astronomers.

 

Best,

JG


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#6 MartinPond

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Posted 21 September 2021 - 01:22 PM

.....

....

 

One of the König designs (field stop - 2 - 1) as also used in the microscopy, is available from Edmund Optics under the name RKE, and it enjoys a very high acceptance among the hobby astronomers.

 

Best,

JG

I'm thinking....the continued RKE use in microscopy is probably due

    to the low designed distortion....for when you will end up measuring things.


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#7 j.gardavsky

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Posted 21 September 2021 - 03:52 PM

I'm thinking....the continued RKE use in microscopy is probably due

    to the low designed distortion....for when you will end up measuring things.

Yes, this is the point.

 

Both the Carl Zeiss and the RKE Königs derivates offer an orthoscopic field within the 20mm x 20mm standard field in their focus planes, when their focus length is in the range 22mm up to 28mm, and the best at 25mm.

These eyepieces, and when for the microscopy, are eventually marked wit "M" - for measurement purposes.

 

Best,

JG



#8 MartinPond

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Posted 22 September 2021 - 12:07 AM

Aha...for sure.  

Yet another reason I suspect "Rank Kellner Eyepiece"

    was a smokescreen of a name. 

   "Rank, Kaspereit, Erfle," is even more misleading...wildly.   

 

    The secret goes way back in time.  Long-spaced Konig-1s 

    were used even in the early 1900s for inspection loupes and reading  ports on meters,

    later for direct-reading dosimeters.  RKE? How about HD/ED-Konig-1?


Edited by MartinPond, 22 September 2021 - 09:03 AM.

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