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Equipment Discussions >> Classic Telescopes

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TOM KIEHL
Pooh-Bah
*****

Reged: 11/17/12

Loc: N.E. Ohio
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: TOM KIEHL]
      #5940103 - 06/25/13 04:33 PM Attachment (24 downloads)

#20 Ttipod spreader hardware

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DAVIDG
Post Laureate
*****

Reged: 12/02/04

Loc: Hockessin, De
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: TOM KIEHL]
      #5940125 - 06/25/13 04:45 PM

The mount and finder are Edumnd. The mirror cell and spider are Novak. I have the exact same mirror cell and I'm building a 6" f/20 Dall Kirkham with it.
The primary is made from an old style Corning "Slope Sided" Pyrex blank which was popular in the 50's thru the 70's. The owner's name in the back and was most likely inscriped when it was coated. The optics are most likely a Dall Kirkham configuration and could have been made by Coulter or 3B Optical. You need the exact radius on the primary and that of the secondary to calculate the spacing needed for the secondary to secondary distance. You'll also need a baffle tube in the primary or the image will be washed out from sky light.

- Dave


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starman876
Postmaster
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Reged: 04/28/08

Loc: VA
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: TOM KIEHL]
      #5940213 - 06/25/13 05:50 PM

wow. that was how mine came. The Edmunds mount with a 6" cassegrain riding on top. Just because the mount says Edmund does not make the optics Edmund. Edmund sold a lot of mounts.

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starman876
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Reged: 04/28/08

Loc: VA
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: starman876]
      #5940218 - 06/25/13 05:53 PM

And that center brace, boy was that an accident looking for a place to happen. Going down memory lane here

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starman876
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Reged: 04/28/08

Loc: VA
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: DAVIDG]
      #5940220 - 06/25/13 05:55 PM

Dave

they were originally F15. Do you have a different secondary?


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TOM KIEHL
Pooh-Bah
*****

Reged: 11/17/12

Loc: N.E. Ohio
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: starman876]
      #5940266 - 06/25/13 06:40 PM

What about the focuser?,,,, Edmunds maybe?,, IF Edmunds,why did Edmunds make a focuser for a cassegrain telescope if they did not sell cassegrain's????????

Edited by TOM KIEHL (06/25/13 06:46 PM)


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starman876
Postmaster
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Reged: 04/28/08

Loc: VA
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: TOM KIEHL]
      #5940324 - 06/25/13 07:20 PM

People bought the optics and then assembled the OTA typical ATM. The focuser looks more like a classic jaegers. Most likely a refractor focuser which is what everyone used back then for a cassegrain/

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actionhac
Post Laureate
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Reged: 08/09/08

Loc: Seattle
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: TOM KIEHL]
      #5940332 - 06/25/13 07:22 PM Attachment (26 downloads)

Here are both refractor and Newtonian Edmund focusers. Look the same as yours? the black knobs are correct the brown knobs I'm not sure (probably radio knobs). And I think Jaegers were the same. The mounting flange on the refractor focuser came in 3 sizes and even more sizes from Jaegers if I remember right. Except the focuser tube looks different on yours.

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amicus sidera
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Reged: 10/14/11

Loc: East of the Sun, West of the M...
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: actionhac]
      #5940347 - 06/25/13 07:31 PM

Could be an Edmund refractor focuser, as they did use that style of knob (Davies Mfg. made them), and if I recall correctly they had one in that flange style circa 1960's. As David noted, the mount and legs are pure Edmund, finder and its rings also, but the optics... no.

Looks to me like L. Steinl was an ATMer intent on putting assembling a nice compound scope with purchased parts. Depending on the quality of the optics, you might have quite a scope there, Tom.

Fred


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DAVIDG
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Reged: 12/02/04

Loc: Hockessin, De
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: amicus sidera]
      #5940404 - 06/25/13 08:13 PM Attachment (17 downloads)

That is also a Novak focuser. Here is a picture of the 6" f20 that I'm building now with the same Novak cassegrain mirror cell that fit 6.75" ID tube and the Novak 1.25" focuser. Here is a link to Novak's catalog, look on page 19 for their cassegrain mirror cells and focuser. http://geogdata.csun.edu/~voltaire/classics/novak/Novak_90_91_Catalog.pdf

- Dave



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DAVIDG
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Reged: 12/02/04

Loc: Hockessin, De
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: DAVIDG]
      #5940434 - 06/25/13 08:31 PM

This scope looks to be based on what is described in Ken Novak's book "Cassegrain Notes". Here is a link to it.
http://bobmay.astronomy.net/CassNotes/#Cass

- Dave


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Dave M
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Reged: 08/03/04

Loc: Ohio
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: DAVIDG]
      #5940459 - 06/25/13 08:50 PM

Dave, i`m curious, is there any purpose to the cross lines etched across the back of that secondary mirror ?

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DAVIDG
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Reged: 12/02/04

Loc: Hockessin, De
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: Dave M]
      #5940497 - 06/25/13 09:20 PM

Quote:

Dave, i`m curious, is there any purpose to the cross lines etched across the back of that secondary mirror ?




Dave,
If the optics are Dall Kirkham type, then the secondary is supoose to be spherical so it has no optical axis. So what can be done is that the secondaries are cored from a much larger convex disk that has been ground, polished and figured to the correct radius and spherically figured. So I'm guessing that cross hairs might be alignment marks on were to center the coring bit to cut out the smaller disk from the larger one.

- Dave


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DAVIDG
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Reged: 12/02/04

Loc: Hockessin, De
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: starman876]
      #5940519 - 06/25/13 09:30 PM

Quote:

Dave

they were originally F15. Do you have a different secondary?



MY set of optics didn't come with any spacing information or radii on the mirrors. I measured the primary radius as 46.50" directly by using a Foucault knife edge test and the secondary was 13.44" via my spherometer. So with a 17.83" seperation between the primary and secondary, that result in back focal length of 10.25" and a focal length of 120". That all fits very nicely for typical an F/20 system.

- Dave


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TOM KIEHL
Pooh-Bah
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Reged: 11/17/12

Loc: N.E. Ohio
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: DAVIDG]
      #5940538 - 06/25/13 09:46 PM

Quote:

This scope looks to be based on what is described in Ken Novak's book "Cassegrain Notes". Here is a link to it.
http://bobmay.astronomy.net/CassNotes/#Cass
- Dave


Thanks David, that was a great piece by Mr. Novak

Edited by TOM KIEHL (06/25/13 09:52 PM)


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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: DAVIDG]
      #5940560 - 06/25/13 10:09 PM

Thanks! Dave, that makes perfect sense..

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Rich (RLTYS)Moderator
Postmaster
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Reged: 12/18/04

Loc: New York (Long Island)
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: TOM KIEHL]
      #5940934 - 06/26/13 06:21 AM

Tom, interesting telescope, let us know how it works.

Rich (RLTYS)


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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: Rich (RLTYS)]
      #5941265 - 06/26/13 11:12 AM

Novak is no longer in business right

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Glen A W
professor emeritus


Reged: 07/04/08

Loc: USA
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? new [Re: TOM KIEHL]
      #5941652 - 06/26/13 03:51 PM

Must not have been coated last in the glory days. The sticker does not have the famous 50s-60s panchro logo on it like so many I've seen. Looks like a beautiful scope, in the making, to me. GW

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TOM KIEHL
Pooh-Bah
*****

Reged: 11/17/12

Loc: N.E. Ohio
Re: ? MYSTERY ? EDMUNDS ? 6" CASSEGRAIN ? [Re: Glen A W]
      #5941873 - 06/26/13 06:20 PM

Yes Glen, the past owner never looked through it,when he got it he said it was SILVERED ,and it was tarnished BLACK,and could not see a image at all. so he sent the mirrors out and had them coated and got them back, and thats as far as he went with it, 45 yrs. ago..

Edited by TOM KIEHL (06/26/13 06:22 PM)


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