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RobertMiller
member


Reged: 05/01/09

What is this thing?? new
      #5577821 - 12/18/12 07:40 PM

So I recently picked-up an old orange tube C8, and the woman who sold it to me gave me this odd piece along with it.
[image][/image]

I have no idea what it is, but it looks like it was expensive to put together.
Any help with identifying it would be awesome.
[image][/image]
[image][/image]
[image][/image]


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glennnnnnn
sage


Reged: 10/20/09

Loc: San Diego, CA
Re: What is this thing?? new [Re: RobertMiller]
      #5578095 - 12/18/12 11:05 PM

It would be nice if you had included a scale in your photos, but it looks like another telescope with all the optics except the focuser.
Did you try it with an eyepiece?


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star drop
contra contrail
*****

Reged: 02/02/08

Loc: Snow Plop, WNY
Re: What is this thing?? new [Re: glennnnnnn]
      #5578510 - 12/19/12 07:49 AM

A miniature SCT finder scope?

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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: What is this thing?? new [Re: star drop]
      #5578564 - 12/19/12 08:38 AM

i think it is a mirror tele.

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frodostang
journeyman


Reged: 08/08/12

Re: What is this thing?? new [Re: orlyandico]
      #5578634 - 12/19/12 09:43 AM

Yes, looks like some type of catadioptric telephoto lens. No other markings except the 9423 on the side?

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astroRoy
professor emeritus


Reged: 07/09/11

Loc: Southern Oregon
Re: What is this thing?? new [Re: frodostang]
      #5578643 - 12/19/12 09:49 AM

I have a "somewhat" similar catadioptric telephoto camera lens with adaptors to fit some of my cameras. Mine is a 500mm 1:8 Seikanon.

Roy


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Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: What is this thing?? new [Re: astroRoy]
      #5578878 - 12/19/12 01:02 PM

AstroRoy's got it. A catadiotic telephoto camera lens that has had what looks like most of the lens body removed. You could probably put a 'T' ring adapter on it & have a fast 500mm fixed focus lens. You might want to check & see if it'll focus by twisting or push/pull.

Clear Dark Skies
Startraffic
39.138274 -77.168898


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: What is this thing?? new [Re: Startraffic]
      #5579418 - 12/19/12 06:41 PM

this is the first time i've heard of an f/8 lens being fast

that said i believe there were some f/5.6 mirror teles made. none of them were of particularly high quality.

might make a good spotting scope though.


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RobertMiller
member


Reged: 05/01/09

Re: What is this thing?? new [Re: Startraffic]
      #5579421 - 12/19/12 06:42 PM

Thanks for the help, guys.

I was kinda thinking it might be a telephoto of some variety, but the housing is completely solid. The other thing that made me question whether it was a camera lens, was its size; it is 8" long and 6" in diameter


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Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: What is this thing?? new [Re: orlyandico]
      #5580821 - 12/20/12 02:41 PM

As opposed to the 14.5" f32 Shiefspeigler binoculars I have planned, f8 IS fast. LOL

Clear Dark Skies
Startraffic
39.138274 -77.168898


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Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: What is this thing?? new [Re: RobertMiller]
      #5580889 - 12/20/12 03:14 PM

Robert,
It might also be a disassembled C8 maybe? Hard to tell with no scale.

Clear Dark Skies
Startraffic
39.138274 -77.168898


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dave brock
professor emeritus


Reged: 06/06/08

Loc: Hamilton, New Zealand
Re: What is this thing?? new [Re: Startraffic]
      #5581450 - 12/20/12 09:00 PM

Quote:

Robert,
It might also be a disassembled C8 maybe? Hard to tell with no scale.

Clear Dark Skies
Startraffic
39.138274 -77.168898




"it is 8" long and 6" in diameter"

Definitely not a C8 then.

Dave


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Al8236
Pooh-Bah
*****

Reged: 08/18/10

Loc: 48.9173N 122.1390W
Re: What is this thing?? new [Re: dave brock]
      #5581830 - 12/21/12 02:59 AM

PM Sent

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JR#8
sage


Reged: 08/31/04

Loc: Edison, NJ
Re: What is this thing?? new [Re: Al8236]
      #5600677 - 01/02/13 02:17 AM

what about an ETX 125

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tim53
Postmaster
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Reged: 12/17/04

Loc: Highland Park, CA
Re: What is this thing?? new [Re: JR#8]
      #5600957 - 01/02/13 10:26 AM

Did Max Bray make SCTs? It reminds me of a 5" Mak he used to sell around 30 years or so ago.

-Tim.


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Al8236
Pooh-Bah
*****

Reged: 08/18/10

Loc: 48.9173N 122.1390W
Re: What is this thing?? [Re: tim53]
      #5601014 - 01/02/13 10:53 AM

Well, I have to fess up,
I purchased this from Robert, and it seems to be an incomplete camera lens of some sort!
The optical layout is, Corrector-Mencius lens-Mencius with mirror spot- Primary mirror-and a achromat in the baffle tube.
I haven't had a lot of time to play with this, But if I remove the achromat and slide a 30mm EP inside the baffle tube I can get it to focus at about 7 ft.
There is no adjustment of any of the elements as they are all held with fixed spacers. So for now it is sitting in the Que for when I have a little more time to take the care and do some sort of ray-trace and see if flipping some of the elements will bring the focus outside of the tube.


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mdavister
member


Reged: 07/10/07

Loc: Pennsylvania
Re: What is this thing?? new [Re: Al8236]
      #6003958 - 08/02/13 09:06 PM

I know what that is, because I have one too. It looks like an objective for the crew served night vision scope, AN/TVS-1. Diameter ~150mm
f:1.4

The one I have has a spot for a cross hair reticle which gets projected back to the eyepiece. I really want to do something with it, but the focus doesn't adjust and the image plane is about 2-3mm from the back glass.

Might I ask how you got that one apart? Mine is glues together.

Edited by mdavister (08/05/13 09:53 AM)


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Al8236
Pooh-Bah
*****

Reged: 08/18/10

Loc: 48.9173N 122.1390W
Re: What is this thing?? new [Re: mdavister]
      #6004499 - 08/03/13 09:50 AM

Yep, this one was glued together as well with some sort of black silicone adhesive. But only the mirror cell, it is just threaded into the end of the tube.
I put a couple bolts in the what appear to be mounting holes leaving them stick out long enough to catch a board laying on the floor, stood on the board and persuaded it to unscrew.
All the other elements come out the other end after unscrewing the ring above the corrector, the rest are just slip ring spacers.
Good luck with getting yours apart. It's not to bad once you get the first quarter turn to get the glue to release!


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