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Early 80’s C8 mirror

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#1 JJBjork

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Posted 13 April 2021 - 05:06 PM

Can anyone to me the best way to clean the primary mirror on my C8, remove it from the back or remove secondary and clean through the tube? What have y’all done successfully?



#2 starman876

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Posted 13 April 2021 - 05:12 PM

remove the back of the cell.  You will never do a good job through the front.


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#3 EXT64

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Posted 13 April 2021 - 05:27 PM

I always removed the corrector/secondary and then pulled the primary out through the front. Is the primary dirty or just dusty? You may be able to blow a lot off with a lens bulb.
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#4 JJBjork

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Posted 13 April 2021 - 07:26 PM

I always removed the corrector/secondary and then pulled the primary out through the front. Is the primary dirty or just dusty? You may be able to blow a lot off with a lens bulb.

It looks like mold or mildew, not sure and the secondary is a little smuggy on both sides



#5 EXT64

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Posted 13 April 2021 - 07:31 PM

Ok, I had one from the same period, though in its case the coating was damaged too. Fortunately the cost to recoat if needed is fairly cheap (or at least was!).
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#6 JJBjork

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Posted 15 April 2021 - 04:44 PM

Ok, I had one from the same period, though in its case the coating was damaged too. Fortunately the cost to recoat if needed is fairly cheap (or at least was!).

Who did you have recoat yours? Celestron?




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