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Focal point and telescopes

  1. Feb 5, 2008 #1
    so i am building a refractor telescope and i dont know what size to make the tube and what material to use for it?
    please telll me this is a huge % on my grade
  2. jcsd
  3. Feb 5, 2008 #2


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    Staff: Mentor

    You need to start by selecting the lens. It determines the size of the tube.
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