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Unusual markings on a 20mm Vixen Kellner

Classic Equipment Eyepieces
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#1 lxeth

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Posted 21 November 2021 - 08:08 PM

I picked up an older Vixen 80mm/f5 a few months ago (not sure if qualifies as a classic scope - it seems to be from about 2000 - If the tag is wrong, please let me know!!) .

80S_sm.JPG

 

It came with two .0965 eyepieces - a 8mm HM, and a 20mm Kellner. The Kellner looks similar to a normal Vixen .965 20mm Kellner from the same period, but it has an unusual marking on the barrel - C-K-20mm.

CK 20_sm.JPG

 

I remember reading somewhere that Kellners perform better in slower scopes, and I thought maybe the Kellner included with the 80/f5 was modified somehow to match the faster focal length, and thus the "C-" marking on the barrel. But, I've compared this EP and a normal Vixen .965 20mm Kellner in this scope and my other longer focal length scopes (an 80/f11 and 60/f15), and I couldn't see any noticeable differences. As far as I can tell, the C-K-20mm EP seems to be just like a normal Kellner.

 

Just wondering if anyone has an idea what the "C" stands for and why it was packaged with the 80/f5 scope?

 

Thanks in advance for any info!


Edited by lxeth, 22 November 2021 - 01:52 AM.

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#2 csrlice12

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Posted 22 November 2021 - 01:30 AM

The Vixen logo looks like one of the earlier ones, maybe 1960s or 70s.  The .965 focuser is old school.   Love the color, very nice looking scope.  No idea what the C means on the Keller.


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#3 lxeth

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Posted 22 November 2021 - 07:29 AM

The Vixen logo looks like one of the earlier ones, maybe 1960s or 70s.  The .965 focuser is old school.   Love the color, very nice looking scope.  No idea what the C means on the Keller.

Thanks for the compliment! Ive been very happy with it! It is my first wide-field RFT and it's been a lot fun to use!


Edited by lxeth, 22 November 2021 - 07:52 AM.


#4 j.gardavsky

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Posted 24 November 2021 - 04:22 PM

Check please, if there is a color fringe on the field stop.

If yes, then the "C" might mean "corrected", "CVD corrected".

 

Best,

JG


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#5 lxeth

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Posted 24 November 2021 - 07:50 PM

Check please, if there is a color fringe on the field stop.

If yes, then the "C" might mean "corrected", "CVD corrected".

 

Best,

JG

JG, Thank you! I will do that and get back to you.


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#6 lxeth

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Posted 25 November 2021 - 09:37 AM

Check please, if there is a color fringe on the field stop.

If yes, then the "C" might mean "corrected", "CVD corrected".

 

Best,

JG

JG, I looked at the field stop on the C-K, but didn't see any color fringe. I also looked at normal Vixen kellner and the field stop seemed the same.

Sorry to disappoint!


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#7 csrlice12

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Posted 25 November 2021 - 11:33 AM

Maybe it means coated?


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