XPost: sci.space.history, sci.space.shuttle   
   From: lou@cadence.com   
      
   "David A. Scott"  writes:   
      
   >   In many ways the Hubble is a failure they never even cut the   
   >mirror correctly. [...]  Hubble could have done much   
   >more if it was ground correctly. The extra lenses added to it   
   >failed to make it as good as it should have been.   
      
   This is not true, except for the very first batch of instruments, all   
   long since replaced.  There are no additional lenses in any of the   
   insruments designed since the flaw was uncovered.   
   In all the new instrucments, since they need one or more   
   mirrors to direct the light within their own optics, they just need to   
   make one or more of these mirrors not quite flat.  This restores diffraction   
   limited optical performance without adding any new elements.   
      
       Lou Scheffer   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)