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11-08-2003, 07:53 PM
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The future is unwritten
Join Date: Oct 2002
Posts: 71,105
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Actually, unlike lenses the mirrors can be made of a number of different materials. The last telescope I put together had two mirrors (24" & 12") of ground Beryllium. The big bugaboo is the coefficient of thermal expansion causes most materials to distort the image with temperture changes. Of course all materials move some with temperture changes even concrete.
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The descent of man ~ Nixon, Friedman, Reagan, Trump. |
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