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Strange optical thing that came with my Unitron

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#1 rweisberg

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Posted 08 October 2021 - 07:33 PM

Strange optical thing that came with my Unitron. Does anybody know what this is? I thought it might be a barlow lens but it doesn’t fit the draw tube or the unihex Eyepiece holder. 

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#2 CHASLX200

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Posted 08 October 2021 - 07:41 PM

Barlow i think.


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#3 ccwemyss

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Posted 08 October 2021 - 07:59 PM

Unihex barlows usually screw into or replace the front tube, as I recall.

 

Chip W. 


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#4 Star Shooter

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Posted 08 October 2021 - 08:02 PM

That is an Eyepiece Turret. It allows you to have multiple eyepieces set up to use quickly. Just rotate the turret.


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#5 rweisberg

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Posted 08 October 2021 - 08:08 PM

Unihex barlows usually screw into or replace the front tube, as I recall.

 

Chip W. 

I thought this was a barlow, but it does not fit. It has a larger diameter than the draw tub or the unihex port.



#6 Star Shooter

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Posted 08 October 2021 - 08:09 PM

Opps, I described the right part. The left part on the napkin is a spare part to something else.

Do you have dimensions? Maybe a estimated focal length for the lens? Need a clue.


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#7 rweisberg

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Posted 08 October 2021 - 08:09 PM

That is an Eyepiece Turret. It allows you to have multiple eyepieces set up to use quickly. Just rotate the turret.

Thanks. But what is the thing on the left? 



#8 Sky Muse

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Posted 08 October 2021 - 09:15 PM

Given that it's a Unitron, a reducer? lol.gif



#9 Terra Nova

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Posted 08 October 2021 - 09:16 PM

Neither Unitron barlow looks like that. The barlow for the Unihex is larger in diameter and thin, it’s basically a lens in a cell. The barlow for the eyepieces and diagonal slips in the barrel of the eyepieces and slips into the nosepiece of the diagonal. When I get a chance, I’ll dig them both out and post pics.


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#10 rweisberg

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Posted 09 October 2021 - 08:00 AM

Thank you for the replies. I will give the dimensions of this strange object. It looks to be of very good build. Quite heavy. Randy

#11 Garyth64

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Posted 09 October 2021 - 08:48 AM

Maybe it's just something the seller had, totally unrelated to a Unitron, and put it in the box when  he sold it to you.   Ask him.


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#12 CHASLX200

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Posted 09 October 2021 - 08:55 AM

Don't look like the barlow that came with my 4" Unitron.


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#13 rweisberg

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Posted 09 October 2021 - 09:21 AM

Here are the dimensions: width is 40mm, height is 80mm. There appears to be two lenses in it, one on top and one on the bottom (one recessed about 15mm into the tube). The construction is quite beefy. There is a groove that runs the length of the barrel and stops at a protruding ring just below the outside threads. It is a mystery object and I think it is something that one of the scope's owners just put in the box. Would like to know what it is. I held it up and used a jeweler's magnifying glass as an eyepiece and it gave a nice view of nearby mountains.  


Edited by rweisberg, 09 October 2021 - 09:25 AM.


#14 rweisberg

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Posted 09 October 2021 - 01:40 PM

Given that it's a Unitron, a reducer? lol.gif



#15 rweisberg

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Posted 09 October 2021 - 01:40 PM

Lol. 😊


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