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Ellipsoidal Formula???

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Posted by Andre Burger/">Andre Burger on August 4, 1999 07:33:31 UTC

The specs for my Dall-Kirham is as follows: Primary mirror: Dia=200mm, Rad=989mm, f/D=2.4725 Secondry mirror: Dia=42.39, Rad=250.4 (spherical) Distance between mirrors=388.93mm Final focus behind primary=246.91mm

My question is: How do I calculate the exact formula for the primary ellipsoid? The only literature available to me is Texereau's "How to make a Telescope", 2nd Ed. In his book, a formula is given to aproximate the curvature. I need to know the exact value for the 2 foci of my mirror. Can anyone help please?

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