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Stargazing Can i use a watch glass as a primary mirror of dobsonian telescope?

  1. Feb 3, 2008 #1
    can i use a watch glass as a primary mirror of dobsonian telescope?
     
  2. jcsd
  3. Feb 4, 2008 #2

    chroot

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    Staff Emeritus
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    No, it would not have a surface even remotely correct enough to focus light. I doubt they're made to any specific curvature.

    - Warren
     
  4. Feb 4, 2008 #3

    russ_watters

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    Staff: Mentor

    I suspect they are actually flat on the bottom...
     
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