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Early GOTO reflector, 8"

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40 replies to this topic

#1 apfever

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Posted 25 November 2014 - 10:10 AM

CHUCK AND PETE, please hush. No no no.

 

Here's the focuser.

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Edited by apfever, 27 November 2014 - 11:37 PM.

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#2 apfever

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Posted 25 November 2014 - 10:10 AM

Other side.

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#3 apfever

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Posted 25 November 2014 - 10:23 AM

The rack draw tube (not shown, still in focuser) is 47mm I.D.  (1.850").

The pull tube on the left is 44.5mm I.D. (1.630").

 

From Left to Right:

Pull tube.

Slip ring for the pull tube. It screws into the draw tube.

Reducer ring that screws into the pull tube.

Final .965" eyepiece holder that screws into the reducer.

 

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#4 tim53

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Posted 25 November 2014 - 10:23 AM

Looks like you found yourself a vintage Japanese large Newtonian there!  Royal Astro?

 

-Tim.



#5 apfever

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Posted 25 November 2014 - 10:25 AM

The cell assembly.

 

The mirror and mounting cell is held in place AND collimated by the three ear tang assemblies.

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#6 apfever

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Posted 25 November 2014 - 10:31 AM

The 210mm mirror is encased. Not exactly conducive to cooling.

 

The larger outside screws go into the tang ring mounted to the OTA. The smaller screws go through the larger ones and screw into the mirror mount. This is a push-pull collimation. The larger screws push on the mirror mount and the smaller screws pull the mount tight to the larger screws.

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#7 Nave

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Posted 25 November 2014 - 10:33 AM

That's a freaking Goto rack on that newt.
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#8 tim53

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Posted 25 November 2014 - 10:34 AM

Awesome!  An 8"!  

 

-Tim.



#9 apfever

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Posted 25 November 2014 - 10:36 AM

Final picture for now.

 

Here's the OTA cell ring. The larger screw sets mirror position, the smaller screw pulls the system tight. Both mounting and collimation in one. This is so much nicer than the offset push pull collimation with two screws side by side.

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#10 tim53

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Posted 25 November 2014 - 10:37 AM

Don't stop there!  You're mean!

 

:grin:

 

-Tim.



#11 apfever

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Posted 25 November 2014 - 10:46 AM

That's a freaking Goto rack on that newt.

 

Keep going folks. Documentation please. I think this might be pre WW II from what I've found, but it gets sketchy back then. Disclosure coming after this group gives me all the information you can muster. I found a seriously bad photo in company literature that sure looks like it. This will take some digging. I've had a tuff time so far.



#12 tim53

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Posted 25 November 2014 - 10:50 AM

Is it just an OTA, or is there a mount?

 

-Tim.


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#13 choran

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Posted 25 November 2014 - 10:54 AM

 

That's a freaking Goto rack on that newt.

 

Keep going folks. Documentation please. I think this might be pre WW II from what I've found, but it gets sketchy back then. Disclosure coming after this group gives me all the information you can muster. I found a seriously bad photo in company literature that sure looks like it. This will take some digging. I've had a tuff time so far.

 

The reducer and focus knobs look exactly like he ones on a Goto refractor.



#14 apfever

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Posted 25 November 2014 - 10:57 AM

Don't stop there!  You're mean!

 

:grin:

 

-Tim.

 

 

Sorry Tim.  I'm fairly limited on items to show. The translation of the website with the photo discusses serious limitations in the factory mount. This one has been adapted to a GEM that I don't think came from the OTA and eyepiece set company. Yeoww, what an eyepiece set too, but that would give it all away. 

 

Here's the secondary assembly I have. I sure don't have any kind of confirmation on this. This is recessed about 12" in from the end of the OTA, which is what the photo I found shows - roughly.

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#15 apfever

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Posted 25 November 2014 - 11:11 AM

Awesome!  An 8"!  

 

-Tim.

 

Basically, but not. This threw me for a loop when I took it apart in the sellers front room. What a front room too, quite the spread.

The open aperture of the primary retaining ring is 8.125" (206.4mm or 8-1/8"). The mirror is slightly larger at 210mm. This matched dead on with other factory literature I found listing specs for this size in a pricing brochure.

 

Here's another strange point. The picture of the scope, and analysis of the mount, is much much older than the rest of the literature it was posted in. It seemed to be just a reference. The translation also mentioned (fairly broken English translation) that there are other sizes (probably) besides the 20cm but a lack of documentation for them. A bit of a strange comment for a company to put in their own paper. 


Edited by apfever, 25 November 2014 - 11:20 AM.


#16 davidmcgo

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Posted 25 November 2014 - 11:37 AM

Wow, wow, and wow!  A Grail telescope for sure!  One good aspect about that cell design is there is no diffraction from clips and any effects of turned edge are masked.

 

Dave



#17 Terra Nova

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Posted 25 November 2014 - 11:40 AM

Definitely a Goto! The focuser and visual back, adapter rings, etc. is identical to the one on my 3" Goto refractor except for the way it mounts to the tube. Goto made a few reflectors and that is one of them for sure! I would estimate it is from the mid 1950s. How cool! I love the way the primary mirror cell/mount is made like one for a refractor objective! I love it!! Congrats Neil! You have a rare find there.

 

Did you get the brushed aluminum finder that goes with it? There is a similar, albeit 6" model showing the same focuser and and same kind of mirror cell in one of the Goto catalogs on Provin's site.


Edited by terraclarke, 25 November 2014 - 11:44 AM.


#18 apfever

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Posted 25 November 2014 - 12:45 PM

OK, it's GOTO.  This is snowballing faster than I have time for this morning and I have animals and chores to tend.

 

go half way down this link to the old looking reflector picture and enlarge the picture.

http://yumarin7.sakura.ne.jp/GOTO.html

 

This looks to be what I have. Mine has a different finder but there are other holes in the OTA.

 

 

I've contacted GOTO Inc. and the scope is being looked into. They are now into the 4th generation of ownership. I have some literature being sent on the history with some pictures. Their archives are admittedly not great so hopefully some scrounging will take place in Japan.

 

I'll get to the mount which I'm sure is not GOTO, but I want to identify it. It has Magnusson setting circles. 

 

Here's the eyepieces. The sun filter is screwed onto a 7th eyepiece that is a longer focal length than the 16mm.  Unfortunately the top ring is missing for this eyepiece but the body and optics are GOTO.  The terrestrial T-30 is complete. All the eyepieces are in good shape with little dust that I won't bother cleaning. Some one posted the 4mm Ortho as "rare" which I always take with a grain of salt, but I'm open to comment.

 

EDIT:   OMG, the sellers just sent me an email that they found the scope instruction sheet, and are mailing it to me. I don't know if this is for the scope or mount. Either way it helps. The sellers bought this 6 to 10 years ago at an auction so there is no contact to prior history.

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Edited by apfever, 25 November 2014 - 01:22 PM.

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#19 albert1

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Posted 26 November 2014 - 07:19 AM

Oh man, that's spectacular. That mirror cell..... Wow.



#20 tim53

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Posted 26 November 2014 - 09:03 AM

What a beauty, Neil!

 

-Tim.



#21 ScottAstroNut

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Posted 27 November 2014 - 04:46 PM

Congrats on such a rare find.  Wow!  :waytogo:



#22 photiost

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Posted 27 November 2014 - 05:08 PM

Very Nice !! :like:



#23 Ducky62

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Posted 27 November 2014 - 10:37 PM

I was hoping someone on this forum was going to get this 'scope. I think the 8" in the catalog is shown on an old looking alt-az mount. Can't wait for more pics!  Good score!


Edited by Ducky62, 27 November 2014 - 10:41 PM.


#24 apfever

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Posted 27 November 2014 - 10:46 PM

This is the "instruction sheet" the sellers mailed.

 

Neither side is an 8". The 6 has the same cell and focuser configuration. I guess the focuser is GOTO from the input so far.

If you interpret the same ol'  link location:  http://yumarin7.sakura.ne.jp/GOTO.html  ,  what it says about the limitations of the mount matches this papers strange statement about being Equatorial for the Southern Hemisphere and Alt/Azm for the Northern Hemisphere.

At least that statement seems strange to me.

 

 

DSCN0487.JPG

DSCN0486.JPG

 

I'll make some color copies and see if I can figure out how to do a scan which would be best.



#25 JWW

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Posted 27 November 2014 - 11:53 PM

Sick!




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