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Re: Ellipsoidal Formula???

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Posted by Robert May on August 4, 1999 17:41:43 UTC

There's one spec that you haven't shown in your post and that is the aspheric deformation for the primary. This will be a number between 0 and -1 (a paraboloid is -1). I don't know where you got your numbers from but a program to design such a system needs to have this number to successfully design the system and thus generates it to insure that the raytrace produces a proper image. The number describes how far you have to go towards a paraboloid surface to meet the curvature shape you need. The book Telescope Optics, Evaluation and Design is available from Willmann-Bell for $25 and the accompanying software (to help in understanding some of the concepts given in the book and to help design telescopes) is another $25 and will give you a lot of information (including the text of the formulas) and why that telescope design isn't very popular.

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