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Forgot to add, i plan to install a compter fan blowing across the front of the mirror a la Alan Adler's sky and telescope article for better cooling and warm boundary layer elimination.
I also have a 200mm f3.75 spherical mirror from aliexpress which i bought thinking it was focal length of 750mm rather than what it actually is, radius of curvature. I might try to parabolize it for figuring learning and then build as a wide field scope maybe astroscan style to be durable for my son. Or maybe is that just too fast and difficult a job?
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