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I purchased this home planetarium:

  1. Jun 13, 2010 #1
    I purchased this home planetarium: http://www.segahomestar.com/Sega_Homestar_Planetariums/Homestar_Extra.html" [Broken]
    It is meant for home use so it is designed to project on to a flat ceiling. Now I want to project it onto the dome indicated in the picture. The problem is it's too small. Only places near the top is illuminated (refer to image). I want to use some optical elements to make it such that more (ideally all) of the dome is illuminated. I'm thinking of using a concave lens. I have some questions:
    1. Will a single concave lens work or do I need multiple lens elements?
    2. I know that there will be distortion, but how bad is it going to be? Can I somehow fix them?
    3. What else do I need to consider?
    4. Are there any alternatives other than using a lens?
     

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    Last edited by a moderator: May 4, 2017
  2. jcsd
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