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Unusual Vintage Finderscope Bracket...Who Made This?

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#1 Tom Duncan

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Posted 21 May 2019 - 12:35 PM

Got this in a recent astro buy, an unusual vintage refractor finderscope bracket with a small unbranded 30mm finderscope in it, possibly not orginal. 

 

What's interesting is the extension cast into it that looks to be a camera platform. Also the diameter of the tube the base bolts to was quite small, around 2". Seems like a pretty fancy bracket for such a small tube and thus objective, perhaps a 40mm?

 

Another interesting aspect of the bracket is the 1/2" hole with thumbscrew that is likely to clamp an arm or some such, possibly a sun projection plate arrangement? 

 

Anyone know anything about this bracket? 

 

Thanks in advance for your input. 

 

Tom Duncan 

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#2 macdonjh

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Posted 21 May 2019 - 12:57 PM

I made it.  It's the only one in existence, so be careful with it.


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#3 Thaeland

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Posted 21 May 2019 - 01:15 PM

My bet is this mounts on a refractor focuser assembly and not the main OTA. That would explain the small diameter of where it mounts.

Jon

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Edited by Thaeland, 21 May 2019 - 01:28 PM.

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#4 Tom Duncan

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Posted 21 May 2019 - 01:21 PM

Hmm, good suggestion Jon, seems plausible. 

 

Tom 



#5 Kasmos

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Posted 21 May 2019 - 01:21 PM

Yes, it probably mounted to the focuser and as you said, the small hole was likely for a solar screen rod. 

It's very cool. It looks like something Goto or Carton would do.  


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#6 Bomber Bob

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Posted 21 May 2019 - 01:46 PM

IF that's the original paint...  Mizar.  It's a 100% match to my AR-1 EQ.

 

(And, Mizar put a 35mm camera mount on the counterweight shaft of the M / P - 100 Newtonians, so puttng one on a focuser is a rather Mizarish thing to do.)


Edited by Bomber Bob, 21 May 2019 - 01:48 PM.

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#7 rolo

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Posted 21 May 2019 - 03:52 PM

Is that a 1/4 20 camera adapter on the side?



#8 Tom Duncan

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Posted 21 May 2019 - 08:24 PM

The paint looks original JW. Might you have an Mizar catalogs that may show it?

 

And yes, standard camera 1/4-20 thread. I don't think the circular pad around the post is original though, looks too new and is a bit too thick. 

 

Tom 



#9 Mike W.

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Posted 21 May 2019 - 10:05 PM

Is that a 1/4 20 camera adapter on the side?

just what I was thinking too



#10 Bomber Bob

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Posted 21 May 2019 - 10:29 PM

Tom, I have only 1 small Mizar catalog, and it has only 1 page of accessories.

 

But in going through some of the others, I found that nice Newtonian focuser that I put on my RV-6:  Royal Astro sold it as an accessory, and it looks like the LN-6E came equipped with it, too.



#11 Tom Duncan

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Posted 22 May 2019 - 10:42 AM

Thanks all. 

 

Tom 



#12 Bomber Bob

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Posted 22 May 2019 - 11:46 AM

Some Goto scopes had tall slender finder brackets, so I'm going through those catalogs, too.



#13 rolo

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Posted 22 May 2019 - 01:05 PM

Doesn't look like any of the Mizars in this catalog.

 

https://wiki.telesco...pes_Catalog.pdf

 

 

GOTO 1974 Catalog nothing in this one. Maybe its an older model?

 

https://wiki.telesco...974_Catalog.pdf


Edited by rolo, 22 May 2019 - 01:15 PM.


#14 Bomber Bob

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Posted 22 May 2019 - 03:03 PM

To make it even more confusing, some of the older Carton scopes had similar tall slender posts for a few finder brackets.  And, a very few HINO-branded scopes as well (in addition to the more numerous HINO/Mizar-branded)...

 

And, I just found a Japanese ad for a 1970s Nikon 80mm EQ kit with the finder on a similar tall stalk.


Edited by Bomber Bob, 22 May 2019 - 03:16 PM.

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#15 rolo

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Posted 22 May 2019 - 03:09 PM

This one is real mystery. It has hints of Tak & Vixen. 



#16 Stew44

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Posted 23 May 2019 - 12:03 PM

I don't think it's Goto.  The set screws and lock nuts look original and not anything Goto-esque.  The mid-70's 60mm Goto School Telescope had a plastic finder bracket that incorporated a hole for the solar projection rod, but a compact squatish attachment to focuser body, not elegant like this stalk.




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