Secondary Mirror Clean CPC 1100

[RJohn (Ridley)]

Hi I have a Celestron CPC 1100 that has been sitting for 11 months or so, with the corrector lens pointing up. Noticed when I got it out the secondary lens has two tracks of clear fluid droplets running down it.

I say fluid because I've read posts where this fluid isn't water condensate and is oil!!?

So the corrector is spotless, can I take out the secondary lens by tilting the tube downwards by loosening the 3 mounting bolts and cleaning it? or do I have to take out the whole corrector assembly?

Ant thoughts?

[Ukastronomer (Jeremy)]

TWO vids I remember, did you google cleaning a sc cass secondary ?

https://www.youtube.com/watch?v=laD1RTbbMik

[Wavytone]

If you do dismantle it, it is very important when reassembling to maintain the orientation (ie rotation) of the corrector with respect to the primary mirror, and the secondary mirror with respect to the primary (or corrector).

Look carefully for a small mark around the perimeter of the corrector and another on the secondary or its cell and these should line up with one on the corrector cell; typically its a line or "V" mark in pencil, or in a dab of black wax on the edge.

If you can't spot such a mark, put a piece of tape on the OTA and a corresponding mark on the corrector and secondary.

[RJohn (Ridley)]

Originally Posted by Ukastronomer

TWO vids I remember, did you google cleaning a sc cass secondary ?

https://www.youtube.com/watch?v=laD1RTbbMik

Appreciate the link, i'll study this before I get going, not looking forward to the job, cheers from me

[RJohn (Ridley)]

Originally Posted by Wavytone

If you do dismantle it, it is very important when reassembling to maintain the orientation (ie rotation) of the corrector with respect to the primary mirror, and the secondary mirror with respect to the primary (or corrector).

Look carefully for a small mark around the perimeter of the corrector and another on the secondary or its cell and these should line up with one on the corrector cell; typically its a line or "V" mark in pencil, or in a dab of black wax on the edge.

If you can't spot such a mark, put a piece of tape on the OTA and a corresponding mark on the corrector and secondary.

Will do, not a job I want to do, I was hoping not to take off the corrector , but it seems like it is necessary with the link kindly supplied by (Jeremy) .. appreciate the tips, will let the forum know how it goes .. thank you