RobertMiller
member
Reged: 05/01/09
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What is this thing??
#5577821 - 12/18/12 07:40 PM
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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: West Coast High Desert
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Re: What is this thing??
[Re: RobertMiller]
#5578095 - 12/18/12 11:05 PM
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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
Snowed In
Reged: 02/02/08
Loc: Snow Plop, WNY
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Re: What is this thing??
[Re: glennnnnnn]
#5578510 - 12/19/12 07:49 AM
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A miniature SCT finder scope?
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orlyandico
Carpal Tunnel
Reged: 08/10/09
Loc: Singapore
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Re: What is this thing??
[Re: star drop]
#5578564 - 12/19/12 08:38 AM
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i think it is a mirror tele.
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frodostang
journeyman
Reged: 08/08/12
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Re: What is this thing??
[Re: orlyandico]
#5578634 - 12/19/12 09:43 AM
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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
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Re: What is this thing??
[Re: frodostang]
#5578643 - 12/19/12 09:49 AM
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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
sage
Reged: 02/12/06
Loc: Lat. 39.143345, Long. -77.1748...
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Re: What is this thing??
[Re: astroRoy]
#5578878 - 12/19/12 01:02 PM
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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.
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orlyandico
Carpal Tunnel
Reged: 08/10/09
Loc: Singapore
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Re: What is this thing??
[Re: Startraffic]
#5579418 - 12/19/12 06:41 PM
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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
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Re: What is this thing??
[Re: Startraffic]
#5579421 - 12/19/12 06:42 PM
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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
sage
Reged: 02/12/06
Loc: Lat. 39.143345, Long. -77.1748...
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Re: What is this thing??
[Re: orlyandico]
#5580821 - 12/20/12 02:41 PM
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As opposed to the 14.5" f32 Shiefspeigler binoculars I have planned, f8 IS fast. LOL
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Startraffic
sage
Reged: 02/12/06
Loc: Lat. 39.143345, Long. -77.1748...
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Re: What is this thing??
[Re: RobertMiller]
#5580889 - 12/20/12 03:14 PM
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Robert,
It might also be a disassembled C8 maybe? Hard to tell with no scale.
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dave brock
sage
Reged: 06/06/08
Loc: Hamilton, New Zealand
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Re: What is this thing??
[Re: Startraffic]
#5581450 - 12/20/12 09:00 PM
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Quote:
Robert,
It might also be a disassembled C8 maybe? Hard to tell with no scale.
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"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
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Re: What is this thing??
[Re: dave brock]
#5581830 - 12/21/12 02:59 AM
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PM Sent
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JR#8
sage
Reged: 08/31/04
Loc: Edison, NJ
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Re: What is this thing??
[Re: Al8236]
#5600677 - 01/02/13 02:17 AM
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what about an ETX 125
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tim53
Postmaster
Reged: 12/17/04
Loc: Highland Park, CA
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Re: What is this thing??
[Re: JR#8]
#5600957 - 01/02/13 10:26 AM
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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
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Re: What is this thing??
[Re: tim53]
#5601014 - 01/02/13 10:53 AM
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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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