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[ATM] Elliptical mirror

I need some help with figuring an elliptical secondary for a Gregorian
telescope ( well two actually). There is plenty of  information available
about  the ellipse, but it all concerns how it can be avoided or eliminated
and little about how to create one.

My first question is:  How do I set 'Fig XP' for an ellipse.  I presume I
must alter the desired deformation number. What is the magic number that I
alter it to?

Second question:  Is there any special stroke that will produce an ellipse.
I have pressed  paper stars into the centre and outside edge of the lap. Is
that the correct thing to do?

Any other tips or advice from an experienced person would be appreciated.

Thanks

Malcolm


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