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.965" for the Classics

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#1 alvin58

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Posted 05 July 2007 - 09:48 AM

Hi everyone,
I recently aquired a Sears Discoverer 60mm. Last night when out viewing I inserted my 32mm TV plossl(I use a .965 x 1.25 diagonal)and started thinking - What kind of stress does this put on the optical mechanics train? I mean these were designed for the .965" EP's and to me it's kind of like pushing it's intended design. Question 1 -- Am I being overly concerned in this respect? And 2 -- Aside from the obvious .965" eyepiece brands(Ziess, Pentax etc ) are there any decent .965" EP out there? Or if these are the only choice,I don't mind spending the money for quality. Thanks for any advice! Allen

#2 Venetia2004

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Posted 05 July 2007 - 10:06 AM

Hi Allen,
My favorite .965 orthoscopic eyepieces are manufactured by Kokusai Kohki. I have a full set that I bought from Japan last year. Excellent quality for about $38 a piece, and they ship fast. www.kkohki.com
Vic
Lynnwood, WA

#3 rwiederrich

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Posted 05 July 2007 - 10:58 AM

Hi Allen,
My favorite .965 orthoscopic eyepieces are manufactured by Kokusai Kohki. I have a full set that I bought from Japan last year. Excellent quality for about $38 a piece, and they ship fast. www.kkohki.com
Vic
Lynnwood, WA



Thanks for the link. My classics need the .965 as well, and a good source is always helpful.

If you are not busy this weekend(the 7th), I am having my dark site open house, and BBQ potluck.

We are located over in Kitsap Co. More like around Bremerton area.

PM me if you are interested in meeting many local CN friends.

Rob
GOMOC(Gold Mtn Observing Center) In 2 days. :jump:

#4 Jon Isaacs

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Posted 05 July 2007 - 11:27 AM

>>>What kind of stress does this put on the optical mechanics train? I mean these were designed for the .965" EP's and to me it's kind of like pushing it's intended design. Question 1 -- Am I being overly concerned in this respect?
---

I think you are being overly concerned. It would take many pounds of force to permenently deform any of the parts, a 32mm Plossl only weighs what 6 or 8 ounces??

Jon

#5 Glassthrower

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Posted 05 July 2007 - 11:35 AM

With the exception of premium .965" eps from the likes of Tak, Pentax, Zeiss, Unitron, etc, most classic scopes will perform "better" with modern eyepieces.

Invest in a good .965"/1.25" adapter or hybrid diagonal, and start using your Plossls and Naglers. :)

Put aside the cheapie eps that come with many of these older scopes and save them for the purposes of keeping the scope kit complete.

Regards and clear skies,

MikeG

#6 Larry10

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Posted 05 July 2007 - 12:19 PM

Stateside I believe Siebert Optics still sells .965mm eyepieces.
Another obvious option is to simply place a "wanted" ad here or on Astromart with specs that meet your needs.

#7 alvin58

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Posted 05 July 2007 - 12:32 PM

Everyone,

Thanks for your spectrum of thoughts and opinions. I do have the hybrid diagonal but was just wondering about todays .965". It's always satisfiyng to me to hear "experiances" thoughts. Allen

#8 rwiederrich

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Posted 05 July 2007 - 12:43 PM

With the exception of premium .965" eps from the likes of Tak, Pentax, Zeiss, Unitron, etc, most classic scopes will perform "better" with modern eyepieces.

Invest in a good .965"/1.25" adapter or hybrid diagonal, and start using your Plossls and Naglers. :)

Put aside the cheapie eps that come with many of these older scopes and save them for the purposes of keeping the scope kit complete.

Regards and clear skies,

MikeG


HEY MIKE....who sells .965 adapters for 1 1/4 EP's :question:

Rob
GOMOC

#9 bendab

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Posted 05 July 2007 - 01:35 PM

Rob,
You can find them at Orion Telescope.

#10 Glassthrower

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Posted 05 July 2007 - 01:44 PM

Hi Rob,

See here :

http://www.agenaastr...dapter-s/85.htm

It's a 1.25" to .965" reducer bushing with a compression ring. (the first one on the list)

It's useful for scopes like my little Pentax 50/600 that has a screw-on .965" diagonal and a drawtube that is too small for a "standard" .965" diagonal or hybrid.

Regards,

MikeG


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