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Has anyone heard of "3BK" or "OR-5 mm PHILIPPINES" eyepieces?

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#1 Jethro777

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Posted 09 October 2019 - 10:47 PM

I can't say I have ever heard of them - so interesting!  

Any idea who made them?  Are they good?

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#2 Starman1

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Posted 09 October 2019 - 10:58 PM

0.965" or 1.25"?

Plastic lenses or glass lenses?

Type of eyepiece?

OR-5 implies "ortho", but that could be a 1:3 or 2:2 design.

BK?  Or is that a 3B Kellner?

Unknown.

Where did they come from?


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#3 Jethro777

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Posted 09 October 2019 - 11:59 PM

They are from Japan. 

Who knows what they are.  

They are 0.965 pieces



#4 macdonjh

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Posted 10 October 2019 - 08:18 AM

Like Starman1, my first thought was a 5mm orthoscopic and a 20mm Kellner, though the "3B" is a mystery.  As to the manufacturer, without other markings I'm not sure we'll ever know.  Are there any other stickers or stamps/ impressions anywhere on either eye piece?

 

As to whether or not they are good, put them in your scope and try them out.  Then you'll know for sure.

 

Perhaps cross-post this in the Classics forum as well.


Edited by macdonjh, 10 October 2019 - 08:19 AM.



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