Re: How to use an optical flat


"Louis Boyd" <boyd@xxxxxxxxxxxxxxxxxxxx> wrote

Helpful person wrote:

One thing to remember. After coating, the flat will be less flat then
it was due to variations in coating thickness. However, the small
difference should not be a problem for your application.

I'm not worried about that. Just about all astronomical telescope mirrors
are tested before they're coated and overcoated. You can't do much about
the figure after they're coated.

What kind of coating and overcoating are now being used typically for
astro mirrors nowadays?

What are the enhanced coatings advertised in Sky a Telescope for example
made of (those for which you have to pay extra for)?

Thx.


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