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Goto's well hung 80 X 1200 refractor telescope

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#1 strdst

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Posted 07 May 2019 - 12:35 AM

Stew44 had asked me three months ago if I would start a post about the "3" mono-axis Goto refractor" that I caretake. Stew knows far more than I about this telescope. Just trying to adjust the mount in the light of day for pictures was well beyond my pay grade. Operating the scope in the dark would be awkward/totally frustrating for me. I have used it on a Nippon Kogaku 65mm mount however with some success.

 

I purchased this 11 years ago from a CN'er in Florida. 11 years! That went fast! So I'll post the photos and Stew will do the rest, right Stew?... Stew??

 

Here is a comparison of wing nuts holding tripod legs to hub. The one in my hand is from a Royal Astro 76 X 1200 telescope, a Tasco 10te. The Goto mount and legs weigh about 45#. That's probably more than the entire R.A. kit including the wood case weighs. 

 

 

 

 

 

   

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#2 strdst

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Posted 07 May 2019 - 12:43 AM

A Fraunhofer achromat...

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#3 strdst

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Posted 07 May 2019 - 12:46 AM

Lens cap.

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Edited by strdst, 07 May 2019 - 01:31 AM.

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#4 strdst

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Posted 07 May 2019 - 12:54 AM

more parts

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#5 strdst

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Posted 07 May 2019 - 01:01 AM

Imagine being at the controls...

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#6 strdst

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Posted 07 May 2019 - 01:09 AM

more tripod... lawn aerator

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#7 strdst

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Posted 07 May 2019 - 01:13 AM

The longer view

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#8 deepwoods1

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Posted 07 May 2019 - 06:35 AM

Ohhhhhhhhhhh........ very nice!



#9 Senex Bibax

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Posted 07 May 2019 - 06:52 AM

Your tag line ("Drinkin' man with a telescope problem") explains the beer bottle eyepiece cap...



#10 Stew44

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Posted 07 May 2019 - 07:59 AM

Thanks Keith for getting this out here in its own posting.  It has shown up in a number of CN posts since surfacing, and given its unique place in not only Goto history, but in Japanese small telescope manufacturing history, there is a lot information we now know.  

 

Here are a few of the posts it's shown up in:

 

1)  https://www.cloudyni...ctor-telescope/

 

post #27, original CN owner Dick

 

2) https://www.cloudyni...xen-custom-80m/

 

post #14

 

3) https://www.cloudyni...re-4-refractor/

 

post #13

 

4) https://www.cloudyni...foinput-needed/

 

post #29

 

The pictures in these posts add to what Keith has posted here, and lots of conjecture/discussion about the interesting mount and accessories.  Hope to add to that with further info.

 



#11 Stew44

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Posted 07 May 2019 - 08:19 AM

Here is the Goto advertising flier.

Goto Flyer 50s.jpg

 

In this series of dated Goto brochures from CN'r Galakuma's old catalogs site we get the impression that the scope was out there pre-WWII (1936).

 

Goto 35-36-38 Catalogs.jpg

 

However, in a discussion with CN'r X3782 in my Goto Zeus Apollon thread, post #33, we learn that this advertisement is actually from 1952.

 

https://www.cloudyni...wwii-1938-1942/


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#12 Stew44

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Posted 07 May 2019 - 08:32 AM

Keith had provided me a picture of the case label.

 

3 Inch MA case label.jpg

 

From my adaptation post of the Goto Optical DomeNavi posting by Kodama-san on using case labels to aide in dating Goto telescopes here

 

https://www.cloudyni...e-label-plates/

 

we have a label that is logo'd with a GOTo symbol, and is missing the four small Japanese characters indicating a Joint Stock Company in front of the Goto Optical Research Laboratory company name.    Without a doubt the scope was manufactured in the 1953-54 time period.  Prior to that date it would be Zeus logo'd, and after that period Goto incorporated again and those four small characters indicating Joint Stock Company would be present.


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#13 Stew44

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Posted 07 May 2019 - 08:52 AM

The advertisement discusses three rather unique mounts for the time.  During the post-WWII US occupation and reconstruction of Japan's industrial infrastructure, resources were scarce.  These three mounts were made with only a single sleeve bearing joint for the RA axis and a typical alt-az altitude plate and bolt combination, both with fine adjustment.  

 

One of these we had seen here on CN a number of times, indicating to me that three or four copies had surfaced in the US.  This is the 60mm telescope on the tipping RA mount with the aluminum dome encasing the mount base.  Here are my Zeus and Goto branded versions of that scope.  It is called the Eros following the Zeus naming convention for the early Goto telescopes and is the third of the three scopes on the advertisement.

 

P4010034.JPG


Edited by Stew44, 07 May 2019 - 09:31 AM.

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#14 Stew44

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Posted 07 May 2019 - 09:29 AM

The first telescope listed on the advertisement is called Castor.  It has the pendulum weights similar to the other two, sports a Comet OTA, and appears to be on more of a photo tripod.  This is the only picture I was able to find, and I do not think one of these has surfaced in the US, nor does one appear in the Japanese Telescope Museum.

 

Goto Castor.jpg


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#15 Stew44

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Posted 07 May 2019 - 09:43 AM

Finally we have this 76mm 1200mm fl version that departs from the Zeus naming convention and is simply called the 3" Single Axis telescope.  It is the second telescope on the advertisement.

 

To me this mount displays a lot of artistry.  Look at this picture of the fine latitude adjustment (the lever piece is missing from Keith's scope).

 

Goto 3 Inch MA latitude adj.jpg

 

And the mount as a whole shows a lot of complexity and attention to flexibility of use.

 

Goto 3 Inch MA mount.jpg


Edited by Stew44, 07 May 2019 - 02:01 PM.

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#16 Dave Trott

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Posted 07 May 2019 - 09:53 AM

The advertisement discusses three rather unique mounts for the time.  During the post-WWII US occupation and reconstruction of Japan's industrial infrastructure, resources were scarce.  These three mounts were made with only a single sleeve bearing joint for the RA axis and a typical alt-az altitude plate and bolt combination, both with fine adjustment.  

 

One of these we had seen here on CN a number of times, indicating to me that three or four copies had surfaced in the US.  This is the 60mm telescope on the tipping RA mount with the aluminum dome encasing the mount base.  Here are my Zeus and Goto branded versions of that scope.  It is called the Eros following the Zeus naming convention for the early Goto telescopes and is the third of the three scopes on the advertisement.

 

attachicon.gif P4010034.JPG

You can see a demonstration of the functions of the strange mount in my video here: 

 

https://www.youtube....h?v=zFNkRna3zBw

 

I am pretty sure the mount on Keith's scope will function in essentially the same way. Everything about the mount is odd, especially the interesting counterbalance adjustments. Very unusual!


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#17 Stew44

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Posted 07 May 2019 - 10:17 AM

Great video Dave (really as are all your videos).  waytogo.gif

 

Here are a couple of pics of what are inside of box lid instructions, and a graphical instruction sheet for assembling the scope.

 

goto 3 inch inst 1.jpg

 

goto 3 inch inst 2.jpg

 

goto 3 inch inst 3.jpg


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#18 Stew44

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Posted 07 May 2019 - 10:22 AM

Accessories are typical of 3" from the early 50'.  The dual purpose solar/sky prism would have been an add-on, but the erector lens assembly with T30-40AH convertible eyepiece and the solar projector would have been standard.  Also the large 40mm Kelner that threads into the draw tube was standard on the 3" (yet not so on my 4").

 

goto 3 inch ma accy.jpg

 

The finder is a Unitron and was adapted to this OTA.  The original finder from images seen and the instructions would be the same that is on my two Eros telescopes in the picture above.

 

 

 


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#19 Steve Allison

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Posted 07 May 2019 - 10:29 AM

Wonderful info, Stew!



#20 Stew44

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Posted 07 May 2019 - 01:05 PM

Discussions with our Japanese friends on Galakuma's forum indicate that these three Single or Mono-axis mounts were invented by Shusuke Kojima while an employee of Goto Optical.  Post-WWII production didn't really get going again for Goto until 1948 or so.  There is an Eros in the Japanese Telescope Museum (JTM) from 1949 so these were sold at least that early as Zeus branded scopes.  My Zeus copy is post May 1951 and before the end of 1952.  The Japanese Telescope Museum has one copy of the 3" Single Axis telescope.  However when Kodama-san discussed this model on the DomeNavi website he used an early picture provided by original CN owner Dick.  So it is rare even in Japan.  Keith's is certainly the only one that has surfaced outside of Japan to date.  This JTM photo shows wooden knobs for slomo adjustment.  To me this means earlier than Keith's example and likely a Zeus branded scope similar to my Zeus Eros.

 

Goto 3 inch MA Japanese Telescope Museum.jpg

 

Shusuke Kojima left Goto in 1951.  He went on to Astro Services Inc and Astro Optical amongst other companies.  The features of this 3 inch Single Axis mount are seen in many of his dual axis or partial axis EQ mounts going forward.

 

Here is a picture of my Tasco 7te and Mayflower 816 mounts.  Compare with this 3" Single Axis mount as to latitude adjustment and other features.  Definitely same kind of functionality with the added Dec axis.

 

P4150098.JPG


Edited by Stew44, 07 May 2019 - 05:25 PM.

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#21 dave brock

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Posted 07 May 2019 - 03:48 PM

I notice the pictures here have the polar axis pointing opposite to the catalogue and that tends to offset the center of gravity a little.

#22 memento

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Posted 07 May 2019 - 04:01 PM

These mounts have a very "arty" appearance. A bit like the Porter Garden Scopes of the 1920s. Well, not really. But just a hint, somehow.



#23 Stew44

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Posted 07 May 2019 - 05:18 PM

I notice the pictures here have the polar axis pointing opposite to the catalogue and that tends to offset the center of gravity a little.

I think the first instruction drawing is closest to reality.  The pivot point for the RA axis latitude adjustment is pretty much over the center of the tripod hub.  So tilt and CG is pretty much the same in either direction for looking north or south.


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#24 strdst

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Posted 19 May 2019 - 10:53 PM

Your tag line ("Drinkin' man with a telescope problem") explains the beer bottle eyepiece cap...

 

Well yeah, but they do fit pretty well.,, and I usually have one handy 



#25 strdst

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Posted 19 May 2019 - 11:10 PM

Finally we have this 76mm 1200mm fl version that departs from the Zeus naming convention and is simply called the 3" Single Axis telescope.  It is the second telescope on the advertisement.

 

To me this mount displays a lot of artistry.  Look at this picture of the fine latitude adjustment (the lever piece is missing from Keith's scope).

 

attachicon.gif Goto 3 Inch MA latitude adj.jpg

 

And the mount as a whole shows a lot of complexity and attention to flexibility of use.

 

attachicon.gif Goto 3 Inch MA mount.jpg

Just looked at this thread since I posted pictures. That part looked familiar. Latitude adjustment?  I do have it. I had no idea what it was for! Sometimes that happens around here. Might I adjust my latitude to like -10 degrees and enjoy some of my last rings open views of Saturn near zenith?

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