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Equipment Discussions >> Equipment

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Ruimteman
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Reged: 04/03/12

Loc: Tokyo
Please help me identify this C8/Vixen SCT
      #5531205 - 11/20/12 10:37 PM Attachment (43 downloads)

Hi experts!
Please help me identify this C8. Is it a C8+ or an Ultima? Any idea when it was made?
Thank you!
Ruimteman


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Ruimteman
super member


Reged: 04/03/12

Loc: Tokyo
Re: Please help me identify this C8/Vixen SCT new [Re: Ruimteman]
      #5531210 - 11/20/12 10:38 PM Attachment (37 downloads)

Second picture.

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Ruimteman
super member


Reged: 04/03/12

Loc: Tokyo
Re: Please help me identify this C8/Vixen SCT new [Re: Ruimteman]
      #5531213 - 11/20/12 10:39 PM Attachment (36 downloads)

Third picture.

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Ruimteman
super member


Reged: 04/03/12

Loc: Tokyo
Re: Please help me identify this C8/Vixen SCT new [Re: Ruimteman]
      #5531215 - 11/20/12 10:39 PM Attachment (33 downloads)

Last one!

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Eddgie
Postmaster
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Reged: 02/01/06

Re: Please help me identify this C8/Vixen SCT new [Re: Ruimteman]
      #5531366 - 11/21/12 12:03 AM

I do not think that this scope was originally a GEM mouted scope. I believe it is a 90s era OTA that was removed from its original fork.

There are two pan head screws visible in the picture on the side of the mirror cell. These heads of these screws appear to be "tipped" to one side like the screw holes are not flush to the wall of the mirror cell.

I believe that the SPC8 (GEM mounted scopes) did not have these screw holes present and that when it was de-forked, someone put these screws in the holes to fill them up.

I owned one of these that had been deforked. I filled the holes with hex head screws that would recess into the holes, but before I did, I had the same Pan head screws sticking out of the side.

Hope this helps.

Edited by Eddgie (11/21/12 12:04 AM)


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Eddgie
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Reged: 02/01/06

Re: Please help me identify this C8/Vixen SCT new [Re: Eddgie]
      #5531374 - 11/21/12 12:09 AM

The Pan head screws were used to attach the declination castings to the OTA. These castings were where the altitude bearings attached to the fork. When you defork, the castings come off with the scope OTA, then you simply remove the two pan head screws on either casting and the castings each come away from the OTA.

Again, I think the scopes that were originally sold for GEM mounting did not have these holes. Only the fork mounted scopes had these holes.

I could be wrong of course.

Here is an article by Rod Mollise that shows pictures of what I am talking about:

Pictures showing dec castings on fork mounted C8 being converted to GEM use

Edited by Eddgie (11/21/12 12:17 AM)


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Ruimteman
super member


Reged: 04/03/12

Loc: Tokyo
Re: Please help me identify this C8/Vixen SCT new [Re: Eddgie]
      #5532834 - 11/21/12 07:16 PM

Thank you Eddgie, lots of good information!

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Jaimo!
Pooh-Bah
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Reged: 10/11/07

Loc: Exit 135 / 40° North
Re: Please help me identify this C8/Vixen SCT new [Re: Ruimteman]
      #5533213 - 11/22/12 12:48 AM

Definitely not an Ultima, the Ultima has a silver U-shaped handle under the the visual back, it's nice handhold to steer the OTA.

The dovetail does look "non-Vixen" with the phillips head screws attaching it to the OTA, typically Vixen would use a hex screw.

Jaimo!


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Geo.
Carpal Tunnel
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Reged: 10/01/08

Loc: Upstate NY
Re: Please help me identify this C8/Vixen SCT new [Re: Jaimo!]
      #5537942 - 11/24/12 10:13 PM

I think what you have is an early G8. I've only seen one of these. They were sold on the first Synta CG-5s, but the dovetail bars were from Vixen. The carrying strap is also Vixen made and was original on the SP-C8. I don't think they were original on the G8. The optical tube is of the type introduced in 1989 as the Ultima 8. The Ultima was the first C8 with the non-finned rear cell casting. It is about a pound and a half heavier than the former design. Folks often refer to this type as the Ultima, even though it technically may not be. The OTAs were all made on the same line. I believe StarBright multicoatings were standard at the time the Ultima type went into production. The screw holes for fork mounting mean nothing all C8s until the gray painted models (about 2007) were drilled for forks. The gray tubes intenede for GEM mounting omitted the fork mount holes and added an extra set of holes for the narrow dovetail bars. The Vixen bar had flanges wide enough to be drilled for the 1.75" spaced holes found on the lower surface of all C8 rear cells.

These early CG-5s could be had with servo motor drive system very similar to the one developed for the 1990 Ultima mounts. It was a step above the later more common Synta stepper drive system.


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orion61

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Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: Please help me identify this C8/Vixen SCT new [Re: Geo.]
      #5540626 - 11/26/12 04:35 PM

That is a(90's) Celestar ota with an old Super Polaris 8 strap/camera adapter... I had each..

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