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Goto Kogaku No 105 60mm - 1200mm f/20

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#1 Stew44

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Posted 16 April 2017 - 05:39 AM

This is my GK Mod 105 (that is correct).  It is the first Goto I acquired and has one of the very best star tests of any refractor I have owned.  It is original except for legs and spreader plate.   The mount is unique in that the OTA has a rod with two sliding studs that fit appropriate holes in the tripod saddle.  Balance is obtained by sliding the OTA and tightening the knurled knobs, locking the OTA at a balance position on the rod.  Also, out of all the Classic refractors I have this is the very best focuser.  Buttery smooth and only a light touch to adjust.  Scope settle very quickly.  The finder slides into a dovetail on the focuser housing and was nicely aligned when I used it the first time in many years this morning.  Lastly the focuser housing rotates on the OTA and can be locked by a small set screw.

 

P4160325.JPG

P4160326.JPG

P4160327.JPG

 

Accessories include H6mm, H9mm and a convertible H12.5-25mm.  There is a Sun filter that replaces the EP top cap, and there is a porro prism image erector.

 

P4160324.JPG

 

Yesterday I realized that Saturn was up in the morning in the shadow of the moon.  I wanted to compare the SPI 60mm f/20 to this Goto and set them up early this morning together.  Temperature was 36F and humidity was 58%.  Seeing was pretty good.  Saturn's rings are open and the views through both telescopes were very nice with 7mm Pentax SMC orthos (171X).  The stiffer focuser and the slightly more wobbly tripod made focusing the SPI more challenging, and it took longer for it to settle.  That said both scopes were giving nice images of the planet.  I moved up to a 6mm Pentax SMC ortho (200X) for both scopes.  Again the Goto was wonderful and the SPI a little more frustrating, but both handled the magnification well.  I would give the edge on image to the Goto, but I think my frustration with the stability of the SPI mount is clouding things a bit.  In any event, I find I am enjoying the tracking game with these Classic mounts.   Even with fairly rough polar alignment they hold true with only RA adjustments for a long time.  I will work on the SPI mount and tighten it up and look forward to doing this again.

 

P4160323.JPG


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#2 strdst

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Posted 18 April 2017 - 12:47 AM

Hi Stew,

 

I also have a few Goto Kogaku telescopes. As you and I both have a deep respect for their optics and build please correct your thread title before you can't. I also have a deep respect for all things Nippon Kogaku and seeing it referred to as just Nippon, while just being incomplete, makes me cringe. KOGAKU is just so cool. why leave it off or mis-spell it? Kogaku = awesome optical. you know like Alvin Clark lol.gif  

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Edited by strdst, 18 April 2017 - 01:04 AM.

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#3 Stew44

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Posted 19 April 2017 - 01:05 PM

Editing title is gone.  I guess I'm dyslexic.


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#4 TOM KIEHL

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Posted 19 April 2017 - 02:53 PM

Editing title is gone.  I guess I'm dyslexic.

Your resident Mod could fix that . wink.gif 



#5 bremms

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Posted 19 April 2017 - 06:51 PM

I have a GK 104. Same OTA on an Alt Az mount. Nice 60mm scope. Lonnnngggg.



#6 strdst

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Posted 19 April 2017 - 10:40 PM

The Goto Kaguko is a beautiful telescope. I shouldn't have mentioned the spelling. Just a word jumble, it's all there. Doesn't matter. I have a Nikkor Kagaru 65mm, at least according to the eBay listing back in 2010. Still a fine telescope. Same caliber as the Nippon Kogaku 65 mm but much, more rare! lol.gif

 

I had the SPI which is also a beautiful fine instrument. Great optics but mount shaky! 



#7 terraclarke

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Posted 20 April 2017 - 10:44 AM

Or you can just stop down a Unitron 142 to 60mm! :lol:



#8 Stew44

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Posted 22 April 2017 - 07:17 AM

Dave Trott and I had the opportunity to get together last week and do some comparing of his Mod 105 Goto Kogaku to mine.  His is an earler version we believe.  And since we had three 60mm, f/20s we thought it appropriate to document.  My GK is on the left, then Dave's and then my SPI.

IMG_0329 (800x533).jpg

 

 

 

 

 


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#9 Stew44

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Posted 22 April 2017 - 07:19 AM

Dave's mount is kind of an elbow mount, while mine more traditional EQ (and similar to Dave's 80mm GK)

 

IMG_0336 (800x533).jpg

 


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#10 terraclarke

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Posted 22 April 2017 - 07:22 AM

What an odd mount! It looks like that long OTA would put a tremendous amount of torque on that joint! Does is want to nosedive?



#11 Stew44

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Posted 22 April 2017 - 07:22 AM

This is mine.  If you've seen Dave's excellent Youtube video on his 80mm GK you will catch the similarity.

 

IMG_0335 (800x533).jpg


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#12 Stew44

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Posted 22 April 2017 - 07:24 AM

In most other ways the scope are very similar - OTA, focuser, finder, lens cap.  And even thought the mounts are different, some parts are the same.  Here the latitude adjuster is 180 out on Dave's from mine.

 

IMG_0348 (800x533).jpg


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#13 Stew44

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Posted 22 April 2017 - 07:29 AM

Mine

 

IMG_0347 (800x533).jpg

 

A number of other subtle similarities that show continual evolution during the production.  It's a shame these aren't serial numbered.

 

Dave has made numerous, very detailed Youtube videos of a wide variety of Classic telescopes.  Compared to the limited posts here on CN, they are wonderfully informative and instructive.  Well worth the time to wonder over to Youtube and look him up. 


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#14 Stew44

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Posted 22 April 2017 - 07:34 AM

What an odd mount! It looks like that long OTA would put a tremendous amount of torque on that joint! Does is want to nosedive?

Not really. Although perception is that it is 'bent' at an angle, you still adjust latitude the same.  Comparing that angle with the more tradition EQ mount on mine, the angle is pretty much the same, just not how we're used to seeing implemented. 



#15 terraclarke

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Posted 22 April 2017 - 07:53 AM

Oh, sorry. I overlooked that it was Dave's. It was,Dave's curious elbow mount that I thought looked unwieldy.



#16 Bomber Bob

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Posted 22 April 2017 - 08:53 AM

My GHS 452 has the newer mount:

 

GHS 452 Refresh S22 (Mount Refresh Complete Right Side).jpg

 

Note that the main polar axis clutch is through the casting rather than a metal band behind the gear.  Also, friction on the axis is adjusted by loosening the grub screw on the chrome end cap, and tightening / loosening the cap itself -- similar to the Swift 838 mount.


Edited by Bomber Bob, 22 April 2017 - 08:55 AM.

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#17 konrad

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Posted 22 April 2017 - 08:54 AM

In most other ways the scope are very similar - OTA, focuser, finder, lens cap.  And even thought the mounts are different, some parts are the same.  Here the latitude adjuster is 180 out on Dave's from mine.

 

attachicon.gifIMG_0348 (800x533).jpg

To be honest I have never seen a mount like that 



#18 Dave Trott

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Posted 22 April 2017 - 09:02 AM

Oh, sorry. I overlooked that it was Dave's. It was,Dave's curious elbow mount that I thought looked unwieldy.

If you compare the horizontal offset both mine and Stew's have about the same amount, so the torque will be the same. Mine is really very stable. It just looks "funny".


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#19 Stew44

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Posted 22 April 2017 - 06:22 PM

JW, what do the legs look like that came with your mount?  Mine do not look like Dave's and I do not have his nifty folding spreader.  I have a heavy set of legs with black spike cones on the end.  I do have nicely chromed Goto leg to head bolts, but given a rather plain grey spreader I think after seeing Dave's that it is not original.



#20 Bomber Bob

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Posted 22 April 2017 - 06:27 PM

Legs before sanding & refinishing:

 

GHS 452 Refresh S10 (Wood Legs).jpg


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#21 Stew44

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Posted 22 April 2017 - 06:27 PM

My GHS 452 has the newer mount:

 

attachicon.gifGHS 452 Refresh S22 (Mount Refresh Complete Right Side).jpg

 

Note that the main polar axis clutch is through the casting rather than a metal band behind the gear.  Also, friction on the axis is adjusted by loosening the grub screw on the chrome end cap, and tightening / loosening the cap itself -- similar to the Swift 838 mount.

Yes, mine has the main polar axis clutch through the casting.  That allows the RA slowmo gearing and the Dec parts to rotate together.  Then there is a smaller ring clutch after the RA gearts that allow the Dec parts to rotate free of the RA gears.



#22 Stew44

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Posted 22 April 2017 - 06:28 PM

Legs before sanding & refinishing:

 

attachicon.gifGHS 452 Refresh S10 (Wood Legs).jpg

So yours has the nifty folding spreader as well?  Dang!



#23 Bomber Bob

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Posted 22 April 2017 - 06:31 PM

Yes, and again Thanks to Pete, I have the circular Bakelite accessory tray that threads onto the fixed center post (left most leg in the pic).

 

GHS 452 Refresh S27 (Accessory Tray).jpg

 

His timing was perfect, as I was all set to re-thread that post for modern hardware!


Edited by Bomber Bob, 22 April 2017 - 06:37 PM.

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#24 Stew44

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Posted 22 April 2017 - 06:32 PM

Hi Stew,

 

I also have a few Goto Kogaku telescopes. As you and I both have a deep respect for their optics and build please correct your thread title before you can't. I also have a deep respect for all things Nippon Kogaku and seeing it referred to as just Nippon, while just being incomplete, makes me cringe. KOGAKU is just so cool. why leave it off or mis-spell it? Kogaku = awesome optical. you know like Alvin Clark lol.gif  

Hi Clark,  took me a bit but title corrected.  I just parted with a Goto much like the one in your picture.  It had almost a Zeiss Traveler scope leg set and a very interesting tripod head that allowed both EQ and AZ use.  It had those two pendulum weights and the individual it came from said it was 1946 vintage.  What do you know about date of manufacture of yours and is it a 60mm f/??  Thanks



#25 Stew44

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Posted 22 April 2017 - 06:35 PM

Yes, and again Thanks to Pete, I have the circular Bakelite accessory tray that threads onto the fixed center post (left most leg in the pic).

Thanks for pic of the bakelite tray.  Dave's has something metal and smaller for three eyepiece.  Check out his video on Youtube for the 105.  Is this Bakelite tray what the original looked like for the later 105?

 

Well, I guess I'm going to have to be happy the optics are so good and at least the legs are worthy of the mount as to stability.  And my Goto leg bolts are much better looking than Dave's!  grin.gif


Edited by Stew44, 22 April 2017 - 09:30 PM.



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