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ha ha sheepsprinklers!
i sent away to america for a book i found at the technical library in perth
(you could not loan books) in 1989 called "telescope optics, evaluation and design" by harrie rutten and martin van venrooij
any how they have a lot of designs for amateurs to make including ray tracing results for three different (long) f/l radii of curvature.... well everything technical to produce one
kept me fascinated for ten years
pat
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