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Fork mounting a Celestron C8XLT ?

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#1 vkhastro1

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Posted 13 January 2019 - 10:59 AM

I own a 1980's fork mount with Byers drive (from a Celestron Super C8).

Just purchased a used Celestron orange tri-lobed C8 XLT optical tube assembly.

I can obviously mount it either in Alt-Az, on a German equatorial or on a Celestron SE or Evolution single fork mount (no interest).

 

Is it possible to remount this newer C8 on my older C8 fork mount?

 

 



#2 PXR-5

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Posted 13 January 2019 - 11:59 AM

Are there holes in the rear cell assy? And do they line up?
Then I don't see a problem, I miss having a fork mounted C8 myself.

#3 vkhastro1

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Posted 14 January 2019 - 02:47 PM

Just checked the distance between the holes on the C8 fork mount - 62.5mm (straight line).

No luck frown.gif

There  on no threaded holes on the C8 SE XLT OTA that correspond to the required hole pattern to mount it on an older C8 fork mount.



#4 photoracer18

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Posted 14 January 2019 - 05:44 PM

I think the only C8 that will fit those forks is an original sandcast C8. Nothing with the tri-lobed Chinese scopes will have the right mounting holes.



#5 vkhastro1

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Posted 14 January 2019 - 06:08 PM

The current Celestron C8 Starbright XLT's light transmission is much superior to the original sandcast C8 (with optional special coatings). I believe the special coatings transmission was still less than the previous C8's Starbright Coatings.

 

A good machinist may be able to drill and tap the correct thread size to match the hole pattern on the original sandcast altitude Trunnions. Not sure if is worth the risk.

 

I will have to be happy with an Alt-Az setup for my C8 XLT OTA (not planning on mounting on my Losmandy G11 mount).




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