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Stargazing Increasing the resolving power of a telescope

  1. Oct 21, 2010 #1
    I have a toy telescope, very poor objective aperture like 30mm, the image is very poor.

    I was wondering if I could increase it's resolving power by placing a convex lens with a larger aperture in front of the objective lens?

    The larger lens should converge more light rays onto the objective giving more light.

    I understand that the telescope is made for parallel rays but wont decreasing the distance to the eye piece compensate?
  2. jcsd
  3. Oct 21, 2010 #2

    Andy Resnick

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    You are thinking mostly correctly, but the increased aberrations from doing what you suggest would likely degrade the image further.

    What you really need is an increased numerical aperture (decreased f-number), and you are probably better off just getting a better telescope, rather than spending that time and money improving a poor quality instrument.
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