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Gregorian Seconcary Excentricity Calculation

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Posted by Armand Auffray on March 26, 2000 16:48:00 UTC

I have made a 6 inche f6.8 paraboloid mirror a few
years ago,I am now making a 12 inch .I want to re-grind the 6 inch to make a gregorian telescope
It is hard go get information on how to
calculate the secondary f ratio (with regards to the primary) and how much
undercorrection (of a paraboloid) in term of excentricity. Can anyone help

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