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Re: [ATM] Blank ratios for different materials.

On Wed, 20 Jun 2007, Mel Bartels wrote:

> > Why is the 9 point worst than the 6 point?
>
> I'll jump in on this one because it's a favorite of mine.  The ideal support
> is a ring such that any sagging of the mirror sags the center and edge
> equally.  By doing so, you have another parabola that simply needs a touch
> of refocusing.  The 6 point support more accurately portrays the ring
> support.  The 9 point support tries to keep center and edge from sagging and
> does not do as well.
>
> Mel Bartels


Now that Mel brought up the ring, I am tinkering with a glass ring
support. I have not decided how to test it yet.

Dominic-Luc Webb

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