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Re: [ATM] Cassegrain Secondary Magnification

Alfredo...
   
  Remember that the lower the primary focal length the harder it is to make. Any abberations left on the primary will be magnified by the secondary as well as the image size.
   
  Ken Hunter
  

Alfredo Rainho Neves <arainho@snowsoft.biz> wrote:
  Hi,

I am trying to design a short tube, long focal length cassegrain (planetary
scope) and would like to know what are the disadvanteges of having high
secondary magnification factor. For example what would be the disadvantage
of having an F1.5 mirror in an F15 cassegrain (10x secondary magnification)?
I do realize that an F1.5 parabolic primary is a challenge. Anyone care to
comment.

Regards,

Alfredo


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