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Goto Kogaku Mod 203

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#1 Stew44

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Posted 28 April 2017 - 07:17 AM

I wanted to share these pics of my Goto Kogaku Mod 203.  Many of you have no doubt seen the great Youtube video that Dave Trott did on this model.  If not, see

 

https://www.youtube....h?v=uoQs326-h00

 

Dave currently has 77 videos on his Youtube website covering most every telescope you may have had or wanted when you were growing up.  You could get a degree in classic telescopes by taking his online 'course'.

 

So here is the Model 203, 80mm - 1200mm, f/15

 

P4280342.jpg

 

While not as impressive as the Mod 204 4", there are some VERY interesting aspects about this mount that should seem familiar.  Here is a picture of the 203 mount and beneath a picture of the 204 mount (and I should say the mounts that came with the 203 OTA and the 204 OTA).

 

P4280343.jpg

P3230243.JPG

 

The mounts are the same, with the exception of the sliding saddle OTA mount on the 203 and the rings and plate on the 204 mount, the field tripod on the 203 mount versus the fixed leg tripod on the 204 mount, the yoke/head assy that is a boxy thing on the 203 and an I-beam thing on the 204.  Finally the counterweight is smaller on the 203.  Everything else is the same.  Interestingly the brochures we've seen from the 50's show the 204 with the boxy type mount base and the 203 with the I-beam type mount base.  The option to switch the mount base type with either scope, along with tripod type lends a lot of support to the idea that there was some type of drive mechanism that went into that box and that you wanted it with the scope or the option to add it.  If anyone has any literature related to that drive compared to the AC drive on the spreader of the 4" I would love to know about it.

 

P4280345.JPG

 

Also the yoke part is much lighter build when coupled with the field tripod compared to the fixed leg yoke.  Same hardware for both leg attachments (note the same bubble level on the leg arm of the yoke).  Here's the field tripod yoke

 

P4280349.jpg


Edited by Stew44, 28 April 2017 - 09:46 AM.

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#2 Stew44

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Posted 28 April 2017 - 07:32 AM

Here is the fixed leg yoke.

 

P3230245rot.jpg

 

While definitely lighter, the field tripod is very well made.  Here are pics of the leg locks and the wonderful field spikes (chromed yet!)

 

P4280348.JPG

P4280347.JPG

 

Finally, this model is complete as to the accessories that originally accompanied the 203 with the addition of the 4mm Goto Or eyepiece to the 6mm HM, 12.5mm HM, 25mm HM and 40mm Kelner, and a sun filter.  And the combination prism diagonal and Hershel wedge has a very nice clear exit dust cover to keep the bottom of the prism clean (don't want to put that in the wrong hole of the prism case frown.gif ).

 

P4280350.JPG

 

Lots of variation in what you could put together back then.  I originally thought this Model 203 telescope would slot nicely between the Mod 105  60mm f/20 and the 4".  Now I believe this is much closer to the 204.  The fixed legs will work fine with this mount's yoke and I will use them rather than the field tripod for observing unless I go to the field.  grin.gif

 

And I do need to comment on the optics.  Star tested last night and they are truly wonderful!  Another great telescope by an enduring master of Japanese telescope making, Seizo Goto.


Edited by Stew44, 28 April 2017 - 07:40 AM.

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#3 Terra Nova

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Posted 28 April 2017 - 08:21 AM

Wow! That is truly a beautiful telescope. Simply wonderful.



#4 rcwolpert

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Posted 28 April 2017 - 08:25 AM

Beautiful scope. . . especially that mount!! Love it!



#5 bremms

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Posted 28 April 2017 - 09:23 AM

VERY nice.. That mount looks every bit as nice if not nicer than a 75mm Unitron. That is a beautiful rare bird.



#6 Bomber Bob

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Posted 28 April 2017 - 09:41 AM

Once again, I'm flabbergasted!  

 

So I can update & edit the Registry, which GOTO scopes do you own now?


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#7 Dave Trott

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Posted 28 April 2017 - 09:43 AM

Thanks for your kind words, Stew. Beautiful shots of these two scopes to compare them. Nice work!



#8 Stew44

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Posted 28 April 2017 - 09:51 AM

Once again, I'm flabbergasted!  

 

So I can update & edit the Registry, which GOTO scopes do you own now?

Sorry for the confusion JW, but Dave and I have been doing some trading. grin.gif   All of these are unserial-numbered.  I have a 105, 203 and 204.  I believe they are all 1957-1958, although only the 204 has the final dated inspection tag.


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#9 Stew44

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Posted 29 April 2017 - 12:19 PM

So an electric clock drive for this boxy type mount does exist, but not for this configuration with the box opening to the front.  It exists for the boxy mount with an opening to left side (from the rear) and has two gear boxes to transfer motion to the RA worm.

 

Goto 4 Mount Drive.jpg

 

Since the box on this mount opens from the front of the drive, under the RA worm, I'm of the thought that instead of a parallel gear train in two gear boxes, the there is likely at least one 90 degree transfer of rotation like this one on the 4" mount transferring rotation around a vertical shaft from the AC clock drive on the spreader to that required by the RA worm.

 

P4290353.JPG

 

About the only hopeful thing that the likely employment of that kind of part suggests (and could be wishful thinking) is that the boxy mount on the 80mm is very likely similar vintage to the 4", and the clock drive coming out the side is perhaps earlier. 

 

In any event I need to change my ads on Amart and CN.  smirk.gif


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#10 Stew44

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Posted 29 April 2017 - 02:04 PM

The RA gear has 250 teeth.  I will look at a 10 RPH AC motor for this.  I am wondering about the power it should have.  I can find something reasonable with 3w, but these may not have enough torque.  Can anyone provide a recommendation for power that may be required with this size of mass assuming well balanced and cleaned and lubed mount?

 

Thanks


Edited by Stew44, 29 April 2017 - 02:44 PM.



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