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GOTO Huygens 6 and 12.5mm eyepieces

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#1 NickG

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Posted 03 February 2008 - 11:51 PM

Recently reading a thread discussing if there were any decent Ramsden or Huygens eyepieces out there, I made the comment I had 2 GOTO Huygens 6mm and 12.5mm eyepieces and wondered if anyone had heard of these before. Bill (WRose), suggested they were decent stuff and that I post some pictures of them here, so here goes.....Hope I can figure out how to provide a link to 5 photos I've placed in the Members Gallery.... :help:

web page

Well, I think I surprised myself and got it to work!

I purchased these 2 pieces back around 1970, as a young teenager, from an optical company that mainly dealt with prescription eyeglasses. There wasn't much around in those days as far astro shops goes, and equipment for that matter.

The condition of these is still pretty good and glass looks pristine. Coatings on lenses looks to be fairly basic, with a slight blue/violet tinge apparent. They have 0.965" barrels, and appear to be made of brass, with the barrels being chrome plated and the rest black.

I used these 2 eyepieces mainly with a 6" F7 newtonian scope I built from the ground up, and remember in 1971 or 72 (my memory fails me now), when Mars was very favourable, getting some incredible views of the red planet, with details I honestly have to say superior to anything I've personally observed since. Why this is the case is a mystery to me, considering the better equipment I use these days (supposedly, anyway). Perhaps my young eyes could pick out things I have trouble with these days, but then again, my eyesight is fine still, and I have more experience now! Go figure! :question:

Well, I do hope there are some that will enjoy these pictures and find them useful, :grin:

Best Regards
Nick

#2 Steve_M_M

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Posted 04 February 2008 - 12:23 AM

Actually, I think the old Goto's are fine eyepieces. One of the best I had was a 4mm Ortho. Absolutely incredible eyepiece. Unfortunately, I sold that many years ago before I knew I was going to fall into Goto heaven.

Attached are some pictures of my Goto collection. (sorry, one Tak slipped in there :crazy:)

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#3 Steve_M_M

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Posted 04 February 2008 - 12:24 AM

More...

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#4 Steve_M_M

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Posted 04 February 2008 - 12:25 AM

The case.

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#5 NickG

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Posted 04 February 2008 - 02:50 AM

Steve, that's a marvellous collection of GOTO's accessories! Didn't realise the interest in this brand all along.

Clear skies
Nick

#6 Wayne Parrish

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Posted 04 February 2008 - 08:37 AM

I have a GOTO ep also. It is a 10-20 mm convertible Huygens. Have you heard of these ? Thanks, Wayne

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#7 Wayne Parrish

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Posted 04 February 2008 - 08:38 AM

Pic 2

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#8 Wayne Parrish

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Posted 04 February 2008 - 08:39 AM

Pic 3

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#9 galakuma

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Posted 04 February 2008 - 09:53 AM

Hi Wayne
I don't know 10-20 mm convertible Huygens.
But I have 12.5-25mm convertible Huygens.
Your Huygens is very rare, I think.

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#10 BHunt

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Posted 04 February 2008 - 12:09 PM

Hi Galakuma,
I also have a Goto 10~20mm eyepiece. But my eyepiece does not have the Kogaku stamp. Just Goto Japan. It is in nowhere near the excellent condition of your eyepieces or Waynes. I just viewed through it in both the 10 and 20mm modes through a wide field scope. It need to be cleaned but provided nice views. I thought there might be a slight edge chip on the bottom lense but when I examined it with a 30 power eye loop it appears to be just dirty but dont know for sure. Let me know if you want it and I can ship it to you free to complete your collection. Just pm me your address.
Respectfully,
Bill

#11 Steve_M_M

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Posted 04 February 2008 - 02:13 PM

It is interesting that my 10-20mm says Goto Opt Japan, Wayne's is Goto Kogaku (I assume of older vintage), and Galakuma 12.5mm-25mm says just Goto Japan.

#12 BHunt

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Posted 04 February 2008 - 02:20 PM

Steve,
You have some nice minty Goto eyepieces there and what a beautiful case. Real quality!
Bill

#13 NickG

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Posted 04 February 2008 - 03:48 PM

They are really nicely made eyepieces. Never new of a 10 - 20mm model before, and Waynes looks in excellent condition.
Thanks for all the extra pics and info from everyone.

Nick

#14 galakuma

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Posted 04 February 2008 - 04:35 PM

Steve, Bill
The oldest Goto's eyepiece written "GOTO KOGAKU",
Next "GOTO JAPAN", And only "GOTO".
The newest is "GOTO" a pale green character.

I have teached from my friend he is very well informed to Goto opt.

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#15 gts055

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Posted 04 February 2008 - 05:04 PM

Hi, I don't know if this is unusual but many years ago, I was given a GOTO 25mm Or eyepiece. Its a really nice thing to use, very clean views and solidly made of brass.

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#16 gts055

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Posted 04 February 2008 - 05:08 PM

Thanks Galakuma, I see my 25mm ortho eyepiece in your brochure. Regards Mark

#17 Dan /schechter

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Posted 04 February 2008 - 06:25 PM

I also own a 10-20mm eyepiece. It says GOTO KOGAKU on it. It came stock with my 2.4" GOTO Hy-score refractor.

Dan

#18 Wayne Parrish

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Posted 04 February 2008 - 07:41 PM

My GOTO came with my 6" Mogey and the mogey was built in the mid twenties. Of course that doesn't mean its that old but I would think maybe 50"s at least. Wayne

#19 Dan /schechter

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Posted 04 February 2008 - 09:49 PM

Hi Wayne, What is the barrel diameter of your 10-20mm GOTO Kogaku eyepiece? Mine is .965" and comes from the middle to late 1950`s. Dan

#20 trainsktg

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Posted 04 February 2008 - 11:18 PM

I have a Goto Kogaku 30~40mm Huygenian with my 2.4" refractor kit.

Keith

#21 Wayne Parrish

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Posted 05 February 2008 - 12:45 PM

Dan, Its 1.25 diameter , Thanks

#22 BHunt

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Posted 05 February 2008 - 05:12 PM

I have a Goto Kogaku 30~40mm Huygenian with my 2.4" refractor kit.

Keith

There you are! Keith you still interested in the 40mm b/c optical ep. If so pm me and I will get one in the mail, It will need a cleaning looks like fibers inside but mint otherwise.
Bill

#23 Dan /schechter

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Posted 05 February 2008 - 09:40 PM

When did GOTO start making 1.25" equipment? Thanks, Dan

#24 WRose

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Posted 05 February 2008 - 11:45 PM

Outstanding Nick! :bow:
:goodjob: Thank you for starting a terrific thread on these Classic eyepieces. Obviously there are quite a few folks around who still appreciate these exceptional eyepieces. Great wealth of information and outstanding pictures of some very rare Classic equipment, please keep it coming. All to often stately eyepieces like these are over looked in today’s rush to newer, wider, better. :bawling:
At the request of an old friend I included the few GOTO I have in my direct comparison testing. So far I have to agree with your remembrances. These eyepieces have consistently provided as good or better viewing as more modern eyepieces costing many times more. Hopefully we can collect and retain documentation of these and other Classics before they slowly fad into oblivion. These great eyepieces are quickly becoming almost impossible to find in useable condition. It's wonderful that this information can be retained for future amateur astronomers so let's see if we can gleen any further tid bits of information and maybe some observing reports and/or commentary that might help others understand and appreciate these classics.

I'll start with some quips from my notes and a few comments.
Eye point is simple; very easy and comfortable to use although they do have a short eye relief (not for folks with eye glasses).
Nice Airy Disk rolling through focus.
The FOV is flat in f/7 and longer focal length scopes with the stars clear, sharp, and pinpoint almost to the edge, no gullwings. Slightest softening in 5-10% of the outer edge.
Very nice color. No tinting or mulling of colors on Jupiter. Excellent light transmission - sky is dark but not stark. Very mild ghosting with Venus at the Field Stop. Effectively no light scatter looking at Jupiter. View is very contrasty, excellent on-axis detail.
The GOTO Or9mm detail and contrast is much better on M44 than the BO/TMB 9mm and noticeably better than the Baader Genuine Ortho 9mm Phantom. Can clearly distinguish the fifth star in the trapezium of M42 with the GOTO Or9mm. The Baader does do a little better at controlling ghosting then the GOTO.


The Swan Nebula (M17) shows nice texture in the nebulosity with the GOTO Or12.5mm . The swan shape just fits in the Or18mm GOTO with a 12" f/5.6 scope which presents an excellent image with distinct nebulosity revealed. (a little soft at the edge with this scope) To my pleasant surprise M31/M32 and M110 are wonderful through the 25mm GOTO. The 25mm GOTO presents excellent detail and a black sky revealing great contrast.
While the GOTO Or & H eyepieces do not have the expansive AFOV of many modern wide angle eyepieces, they bring in so many pinpoint stars it gives me a sense of being plunged into the nebulosity of these targets. As a planetary eyepiece the GOTO will hold their own against many of the much more expensive eyepieces folks usually seek for this purpose.

Again, my thanks to Nick, Steve_M_M, and all. Anyone else have a bit of information or observing review/comparison on the GOTO eyepieces?

#25 NickG

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Posted 07 February 2008 - 07:16 PM

Thanks for the great report too Bill. Fantastic stuff!

It's funny, but I get more excited reading all this than reviews of the latest and greatest stuff. Like many others, I have quite a few other pieces of glass from XW's, TMB, Taks, to TV, etc, etc. But it must be the exciting memories of the early days, when you first gazed in absolute wonderment on these celestial show-pieces! And the feeling of observing and not knowing as much about the objects and letting your imagination do the rest. These days, with all the incredible imaging gear, and space missions, it can dull the sensation a bit. Maybe I'm just old-fashioned.

I can't wait to get a couple of free nights with clear skies, and press my GOTO's back into action, along with a few other oldies. And report what I saw......

You know, I still have the old 6" F7 reflector. First scope I ever built. Had offers to take it off my hands, but somehow I can't let go.

Clear skies
Nick


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