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Celestron C8 Registry

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1543 replies to this topic

#1526 CHASLX200

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Posted 18 May 2024 - 07:07 AM

Some 6x30's are good. This old Meade is very good and this later made 1990's finder is good.

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#1527 pierce

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Posted 18 May 2024 - 01:52 PM

why are those any better than other 6x30s ?   bet they have the same sort of narrow field of view Ramsden or Kellner eyepieces.   40 degree AFOV divided by 6X gives a 6 degree actual field, it can be darn hard to find your reference stars in that.



#1528 CHASLX200

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Posted 18 May 2024 - 02:08 PM

why are those any better than other 6x30s ?   bet they have the same sort of narrow field of view Ramsden or Kellner eyepieces.   40 degree AFOV divided by 6X gives a 6 degree actual field, it can be darn hard to find your reference stars in that.

I don't need any stars. Just center a planet and i am done.



#1529 mdowns

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Posted 18 May 2024 - 02:16 PM

This is the c8 registry thread folks. Please keep your comments focused on the thread's topic.


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#1530 Brisby2

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Posted 18 May 2024 - 07:17 PM

Serial number 359.

 How do I get this mirror out? Remove caulk and it should come out right? 
I’m new to this so I’m learning as I go. Also where might I find parts? I’m missing the finder and might need a secondary mirror replacement. I need a schematic for the collimator on the secondary. Primary too for that matter.

 Any hints would be greatly appreciated.

Tricolor ugly C8!! I love those things.

 

I don't think you have to remove the silicon. Remove that metal baffle stop ring (the gray C-ring) and the strip the focuser assembly on the back until you can push and pull the primary by hand. Once you remove the baffle stop, you should be able to slide the primary mirror out of there. Though, I think it comes out with part of the tube. 


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#1531 Jeff L

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Posted 21 May 2024 - 10:59 AM

What needs to be done with this secondary? That discoloring is in not on the glass.

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#1532 pierce

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Posted 21 May 2024 - 11:16 AM

looks like it needs to be realuminized.   usually secondaries get done with the primaries as doing both is virtually the same effort as doing just the primary.



#1533 Astrophoche

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Posted 21 May 2024 - 04:47 PM

Point of order! This is a registration thread is it not?  Starting a new thread to discuss this project would be of great benefit to others because it could be put in a topic that is related to restoring old scopes. 


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#1534 CHASLX200

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Posted 21 May 2024 - 05:57 PM

What needs to be done with this secondary? That discoloring is in not on the glass.

Normal for the Meades back in the early 80's. I don't remember hearing about it much for Celestron.



#1535 nexstar11

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Posted 24 May 2024 - 02:00 AM

Off topic a little.

A local college called us and ask we look at their scope. Any idea of age of this scope?

anyone have an owners manual?

 

Celestron 14 Schmidt Telescope. 3910mm – f/11 efl 154 in., Celestron International Torrance Calif. Serial Number 1381

 

I would do a star test after collimation and cooldown to see how good the optics are. Mid 1980s scopes are rumored to have been hit and miss due to large volumes of scopes being put out by Celestron around Comet Haley time frame. Could only be a rumor though.


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#1536 RSX11M+

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Posted 27 May 2024 - 05:41 PM

Serial number 359.

 How do I get this mirror out? Remove caulk and it should come out right? 
I’m new to this so I’m learning as I go. Also where might I find parts? I’m missing the finder and might need a secondary mirror replacement. I need a schematic for the collimator on the secondary. Primary too for that matter.

 Any hints would be greatly appreciated.

 

Welcome, and thanks  for registering   You've already received some good help from members, so I'll try to fill in the blanks, at the risk of some redundancy.

 

Your serial number and photos establish that you have a 1971 vintage Velvetone Tri-Color Sandcast Celestron C8. You should know these early models have some collector value, and ordinarily we would not advocate full disassembly or refinishing them. Yours, given some optics issues, would benefit from some work.

 

Please be cautious when attributing diagrams and procedures from other manufacturers as applying to your scope. Because of it's extreme age, even some Celestron C8 information and guidance may be of limited value.

 

One such example regards the mount for your secondary mirror, which is 4-screw and metallic not 3 or plastic. Others apply to parts like gaskets, paint colors, and powering.

 

You have begun a fun and fulfilling experience, and will be best assisted in the forums by starting your own thread in one of the vintage help forums.

 

Other questions you've posed about finders, while appropriate here in so far as original authenticity, have already been answered. Further inquiries of this nature we can continue to answer, but as much as w'd like to help, general knowledge assistance  is best served elsewhere.

 

Once again, thank you for registering.


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#1537 msinc

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Posted 28 May 2024 - 06:40 AM

Serial number C8+
C8+
C8+ mount

Hello from Maryland.....first post. I would like to "register" my C8+. This was actually my father's telescope that my sister and I put together and bought for him in the mid 90's. He passed away in 2004 and it has been mine ever since. It hasn't really been used much. If I remember correctly, it was purchased new from Ritz Camera in the Annapolis Mall {Parole}. I cannot give an exact year, but I believe it was 1994 and I also believe it was late July. This was a birthday gift and his was 4-Aug. I had it at my cabin in the mountains of Virginia for the last several years as there is practically no light pollution there. Just brought it back this weekend and plan to start up using it again. I have a lot of questions, but will post them in the correct spot. 


Edited by msinc, 28 May 2024 - 06:41 AM.

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#1538 Jeff L

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Posted 02 June 2024 - 03:48 PM

I got another one. My next door neighbor gave it to me for work that I have been doing.

#4143  8.

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Edited by Jeff L, 02 June 2024 - 03:49 PM.

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#1539 Frankastro

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Posted 11 June 2024 - 02:52 PM

 Hello,

 

Please find my old C8 from France. Ref : 175 767

An elderly person gave me these telescopes. I do not know the purchase dates.

 

20240424 195033
 
And the serial number :

 

20240424 201405

 

 

Probably 1977 ?

 

This person also gave me a C14 smile.gif

C8 and C14

 

Frank


Edited by Frankastro, 11 June 2024 - 03:02 PM.

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#1540 Brisby2

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Posted 11 June 2024 - 06:36 PM

I've got two more C8s to add to the registry!

 

Orange tube C8 #804100. Had a messed up focuser but I was able to source some parts for it and repair it. Comes with the wedge and tripod and trunk case as well, but also had to source a power cable. 

 

Black tube Celestar C8 #895490. Just picked up this one in a bundle with the wedgepod, no handbox unfortunately. I believe this is the earlier Celestar with no PEC.

 

IMG_5270 (1).jpg


Edited by Brisby2, 11 June 2024 - 06:37 PM.

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#1541 pierce

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Posted 11 June 2024 - 08:00 PM

...

Black tube Celestar C8 #895490. Just picked up this one in a bundle with the wedgepod, no handbox unfortunately. I believe this is the earlier Celestar with no PEC.

 

 

the hand controller just controls the clock drive, -RA stops it, +RA doubles it, its pretty useless.   I can see in your pic, you don't have the DEC screw motor, so +/- DEC does nothing.



#1542 Brisby2

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Posted 11 June 2024 - 08:07 PM

the hand controller just controls the clock drive, -RA stops it, +RA doubles it, its pretty useless.   I can see in your pic, you don't have the DEC screw motor, so +/- DEC does nothing.

I know, it would just be nice to have though for sake of completion. I do also have a declination motor on hand somewhere. I think it's a Meade though so it may not work.



#1543 Eric Greene

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Posted 22 June 2024 - 04:24 PM

The C8 that Brisby2 mentioned above is now at its new home in Durham, NC.

 

This is my third C8 since buying my first in 1977.  Sold that one in Atlanta a few years later, then bought another one around 1989.  That one moved to Ohio with me where it was deforked and mounted on an Ioptron CEM45.  Sold off all my gear including the C8, the Ioptron mount, and my 16" StarMaster with a Zambuto mirror.   Alas, I never noted the serial numbers of the 2 previous C8s.  

 

The new scope has the serial number mentioned by Brisby2 - Orange tube C8 #804100.

 

Wife says I'm much happier with a telescope I can handle at the age of 78.  I quite agree with her!


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#1544 Mr Magoo

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Posted 05 July 2024 - 06:29 PM

Is there an updated registry document somewhere to be found? 




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