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Celestron C8 Registry

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1186 replies to this topic

#1176 kit.kenneth

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Posted 11 January 2022 - 03:45 PM

I just picked up a SP-C8 from Goodwill:

 

_DSC8741.JPG

 

Not sure if the s/n is in the registry, and it is 836364

 

_DSC8743.JPG
 
I don't know if the previous owner did anything to it, but some of the screws look a bit crooked. I haven't had first light on this scope yet; is it generally advisable to bring old scopes to Celestron for service (they fortunately are close by)?

 

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#1177 CHASLX200

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Posted 11 January 2022 - 03:52 PM

Looks ok to me.


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#1178 Kasmos

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Posted 11 January 2022 - 03:57 PM

 

is it generally advisable to bring old scopes to Celestron for service (they fortunately are close by)?

 

It depends on what is wrong with it, your skill level, and confidence to do the work. It's been reported that a routine cleaning and collimating by Celestron runs about $150. Like everything maybe more now?


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#1179 CHASLX200

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Posted 11 January 2022 - 04:04 PM

It depends on what is wrong with it, your skill level, and confidence to do the work. It's been reported that a routine cleaning and collimating by Celestron runs about $150. Like everything maybe more now?

Plus shipping both ways. I would do it myself. Scope looks fine as is or least try it out first.  Could be a freaky sharp OTA.


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#1180 kit.kenneth

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Posted 11 January 2022 - 04:25 PM

Thanks for the reply.  You are right; I should use it first and see if I even notice any issues.  The crooked screws I was referring to are like this pair (see picture).  They seemed to stick out more than I thought they should, but I am guessing they are for attaching accessories and not for holding the OTA together, so I probably worry unnecessarily.

 

 

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#1181 CHASLX200

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Posted 11 January 2022 - 04:38 PM

Thanks for the reply.  You are right; I should use it first and see if I even notice any issues.  The crooked screws I was referring to are like this pair (see picture).  They seemed to stick out more than I thought they should, but I am guessing they are for attaching accessories and not for holding the OTA together, so I probably worry unnecessarily.

If they go in too far they can hit the mirror.


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#1182 RSX11M+

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Posted 11 January 2022 - 05:45 PM

I just picked up a SP-C8 from Goodwill:
  
Not sure if the s/n is in the registry, and it is 836364
 
I don't know if the previous owner did anything to it, but some of the screws look a bit crooked. I haven't had first light on this scope yet; is it generally advisable to bring old scopes to Celestron for service (they fortunately are close by)?

 I'd like photos of the screws if you can before commenting. These are really my only concern.
 

Thanks for the reply.  You are right; I should use it first and see if I even notice any issues.  The crooked screws I was referring to are like this pair (see picture).  They seemed to stick out more than I thought they should, but I am guessing they are for attaching accessories and not for holding the OTA together, so I probably worry unnecessarily.

 

kit.kenneth - Congratulations! Thank you for rescuing it. It will return the favor by bringing many years of pleasure.You've already received excellent help, so I'll try to fill in the edges.

Your scope was not previously in the registry, and looks to be circa late 1985 vintage. (perhaps what we call a "Christmas Scope")

From your photos I agree - it's in great shape (Like to see pics of the mount however) 

If you are already familiar with operating it, then definitely a good idea to take it out for a spin before servicing of any kind, by you or Celestron. From what I understand, Celestron is only servicing the OTAs on these older units, but I don't know the parameters.

However if you aren't familiar, and being you're in so-cal - I'd advise you seek out a larger star party to get some knowledgeable assistance. That, and the manuals (which are quite good) will keep you from making any nube mistakes you might later regret. The manuals should also help you identify missing items that might be required.

 

I would advise against any collimation or cleaning until you're more well acquainted.

 

Finally, have a thought about obtaining a case for the OTA. The finders are especially vulnerable to being broken off, and you wouldn't want to damage it in other more serious ways.

 

 

Best of Luck to you both - Clear Skies and thanks for Registering. 



#1183 RSX11M+

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Posted 12 January 2022 - 05:07 PM

post-376569-0-32205800-1641936304.jpg

 

Upon re-examining this photo, I don't think these particular screws are "crooked" or cross-threaded.

 

They appear to be the holes originally intended to attach the OTA to a fork mount DEC adapter.  (there's a matching set on the opposite side) The holes for those mounts are not "Radially drilled", so the outer two of the 3 appear crooked. 

 

What to do:

 

These screws are probably short place-holders just to fill the holes. However, If your OTA was once Fork-Mounted, there is a concern that they might be the Original screws, and are too long to be installed without the DEC adapter. This might mean they protrude into the OTA and touch the Primary mirror or restrict it's movement.

 

Use a flashlight to examine the interior of the OTA (without disassembling it) to see if they stick out of the sidewall. If so - remove and save them, replace with shorter ones.

 

I myself use allen-head "Set Screws" in the holes, aside a short thread to friction-secure them in place. (No locktight near optics!) 

C8-DEC-hole-plugs.jpg

 

Sorry for the delayed response - some images and thoughts take a bit to sink in.


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#1184 kit.kenneth

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Posted 12 January 2022 - 05:15 PM

This is really helpful information.  Let me take a look and see.  It's going to be cloudy for the next few days, so probably not able to see much, but good opportunity to get the scope ready.

 

Thank you again!

 

 

 

Upon re-examining this photo, I don't think these particular screws are "crooked" or cross-threaded.

 

They appear to be the holes originally intended to attach the OTA to a fork mount DEC adapter.  (there's a matching set on the opposite side) The holes for those mounts are not "Radially drilled", so the outer two of the 3 appear crooked. 

 

What to do:

 

These screws are probably short place-holders just to fill the holes. However, If your OTA was once Fork-Mounted, there is a concern that they might be the Original screws, and are too long to be installed without the DEC adapter. This might mean they protrude into the OTA and touch the Primary mirror or restrict it's movement.

 

Use a flashlight to examine the interior of the OTA (without disassembling it) to see if they stick out of the sidewall. If so - remove and save them, replace with shorter ones.

 

I myself use allen-head "Set Screws" in the holes, aside a short thread to friction-secure them in place. (No locktight near optics!) 

attachicon.gifC8-DEC-hole-plugs.jpg

 

Sorry for the delayed response - some images and thoughts take a bit to sink in.



#1185 CHASLX200

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Posted 12 January 2022 - 07:11 PM

I heard a not so nice sound one time when sometime screwed in a screw too deep and chipped the mirror.


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#1186 RSX11M+

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Posted 12 January 2022 - 08:52 PM

I heard a not so nice sound one time when sometime screwed in a screw too deep and chipped the mirror.

Was it as bad as the wailing afterwards?



#1187 CHASLX200

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Posted 13 January 2022 - 06:53 AM

Was it as bad as the wailing afterwards?

Just about.


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