GOTO Huygens 6 and 12.5mm eyepieces
Posted 03 February 2008 - 11:51 PM
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!
Well, I do hope there are some that will enjoy these pictures and find them useful,
Posted 04 February 2008 - 12:23 AM
Attached are some pictures of my Goto collection. (sorry, one Tak slipped in there )
Posted 04 February 2008 - 02:50 AM
Posted 04 February 2008 - 08:37 AM
Posted 04 February 2008 - 09:53 AM
I don't know 10-20 mm convertible Huygens.
But I have 12.5-25mm convertible Huygens.
Your Huygens is very rare, I think.
Posted 04 February 2008 - 12:09 PM
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.
Posted 04 February 2008 - 02:13 PM
Posted 04 February 2008 - 02:20 PM
You have some nice minty Goto eyepieces there and what a beautiful case. Real quality!
Posted 04 February 2008 - 03:48 PM
Thanks for all the extra pics and info from everyone.
Posted 04 February 2008 - 04:35 PM
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.
Posted 04 February 2008 - 05:04 PM
Posted 04 February 2008 - 05:08 PM
Posted 04 February 2008 - 06:25 PM
Posted 04 February 2008 - 07:41 PM
Posted 04 February 2008 - 09:49 PM
Posted 04 February 2008 - 11:18 PM
Posted 05 February 2008 - 05:12 PM
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.
I have a Goto Kogaku 30~40mm Huygenian with my 2.4" refractor kit.
Posted 05 February 2008 - 09:40 PM
Posted 05 February 2008 - 11:45 PM
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 todayâ€™s rush to newer, wider, better.
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?
Posted 07 February 2008 - 07:16 PM
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.