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RE: Help With Info

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Posted by Steve Fejes jsfejes@swva.net on July 15, 2000 13:22:25 UTC

The best place to start is probably with the book How To Make A Telescope by Jean Texereau. It is available from www.willbell.com which is a source for astronomy and telescope books and mirror making supplies.
A longer focal length is easier to make well and normally gives better results, but it makes a long telescope which is harder to store and move around. A truss tube design with a Dobsonian mount makes it more portable.
I would probably make a 14" mirror at f/5. If I had an observatory to keep the scope in I might go with f/6 or f/7 because I appreciate the improved image quality for observing the planets.
I`m not sure what you mean by "the focusing optics." The surface saggita (depth of curve) is about 4.37mm for a 14" f/5 mirror according to my calculations.
Let me know if I didn`t answer your questions. Steve Fejes

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