On Jan 7, 6:26*am, Helpful person wrote:
On Jan 7, 9:02*am, RMOLLISE wrote:

On Jan 6, 5:26*pm, "Mickman" wrote:

Can you get a new secondary mirror for a C8 thats at least 10 years old?

You might find a secondary surplus, but it is unlikely it will work
well. Celestron applies figuring to its secondary mirrors to bring the
optical systme fully within spec.

What figuring? *Surely the mirror just needs to be flat and mounted as
stress free as possible.

Hi
The secondary on C8 isn't flat. It is a hyperbolic convex
mirror surface.

For the original poster:
What is the problem with the mirror you have. Mirrors
can be recoated. Of course if it is broken, that is a different
story.
Dwight