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  1. Path: sparky!uunet!dtix!darwin.sura.net!zaphod.mps.ohio-state.edu!usc!sdd.hp.com!ux1.cso.uiuc.edu!news.cso.uiuc.edu!lyra.scs.uiuc.edu!mcdonald
  2. From: mcdonald@aries.scs.uiuc.edu (J. D. McDonald)
  3. Newsgroups: sci.astro
  4. Subject: Re: > C8 stories + radial guider bug
  5. Message-ID: <mcdonald.253@aries.scs.uiuc.edu>
  6. Date: 27 Aug 92 19:06:38 GMT
  7. References: <-xcn+bb.benoit@netcom.com>
  8. Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
  9. Organization: UIUC SCS
  10. Lines: 79
  11.  
  12. In article <-xcn+bb.benoit@netcom.com> benoit@netcom.com (BENOIT SCHILLINGS) writes:
  13.  
  14.  
  15. >Could someone raytrace a star image at 0.5 inches from
  16. >the optical axis for a C8 f/10. This could be
  17. >the best way to know for sure.
  18.  
  19. Sure. This is actually for a Meade 8 inch f/10, but Celestrons
  20. are essentially identical.
  21.  
  22. begin 0666 beam3.gif
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  80.  
  81. end
  82.  
  83.  
  84. The dimensions are in inches. You'll note that coma predominates,
  85. but lurking under there is indeed lots of astigmatism. My tracer 
  86. program does not give a breakdown into the primary aberrations,
  87. just the spot diagram. You'll note the abysmal image. Yes, experiment
  88. agrees.
  89.  
  90. Doug McDonald
  91.