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Monty

Cleaning dust/debris from inside a Celestron C8 SCT

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Just took a look at the inside of my SCT and there appears to be a lot of dust and what appears to be manufacturing debris on the inside.

Its a Celestron C800 CPC and I've no experience on internal cleaning. I don't think I want to chance it either.

Does anyone know of a commercial cleaning service?

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It takes only a couple of minutes to take the corrector off. As long as you mark it when removing it to ensure it goes back correctly, you will be fine.

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For the cleaing fluid do I need de-ionised water with a little alcohol?

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Are you talking about cleaning the tube surface or the glass?

If the tube I would wipe and flock it - get the protostar flockboard as it is non sticky and easy to lay

If the corrector glass, I found that different solutions give an improvement but dilute isoprophenol gives a good result (distilled water and isopropenol)

or try baader wonder fluid - there isn;t much in it IMHO

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Cheers for that, i need to clean both so I'll go grab some de-ionised water tomorrow and alcohol,

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If there is a little bit of dust and debris on the inside, just take the corrector (mark it first like Zakalwe said) off then point the OTA down as to not get any more dust in it. Then air dust the mirror until all the dust is gone. Wait a few minutes for the dust to settle down and dust it again in case there is still any that settled inside the OTA. Once you're satisfied with the cleanliness, put the corrector back on and align the marks. Should be good as new! Or better in this case.

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With six screws it seems fairly straight forward. Quite amazed at just how dusty it is inside, I can only think it was like that when built.

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Okay team, corrector is as clean as it can possible be now.

The debris is dark and soft so I'm thinking it's from the cork that holds the corrector in place. Putting the six screws back in I noticed they rub against the cork so maybe the debris was pushed inside during assembly.

All I need now is a good alignment on Arcturus and a Phillips screwdriver to check collimation. Might buy a picostar so I can do servicing when its a cloudy day.

Thanks for the moral support. It was as easy as you said after all.

Edited by Monty

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I'm glad it's back together and clean.

Did you manage OK to align the corrector with the primary using the marks provided on the corrector ?.

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No marks on the corrector so I used a marker pen and put two spots on with 120 degrees between them so no chance of a mistake.

Edited by Monty

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No marks on the corrector so I used a marker pen and put two spots on with 120 degrees between them so no chance of a mistake.

Good move !

Sounds like Celestron have stopped marking the correctors now - or perhaps their orientation is less critical than it was in the past.

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Well collimation is spot on. Stars are producing nice rings out of focus and M57 was pretty good considering the time, humidity and light pollution. After midnight when the lights go off I'll give some of the harder DSOs a go.

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