From: r_delaney2001@yahoo.com   
      
   I attended a seminar on computational imaging last week.   
   It was mostly over my head, as usual.   
      
   The speaker discussed a research project.  They work   
   on the problem of maintaining focus, or de-blurring,   
   an object as it moves along the z-axis, that is, in   
   and out of the focal plane.   
      
   The key element is a customized phase filter, inserted   
   in front of the objective lens.  Apparently a major   
   design challenge, as it can't be solved analytically,   
   and even numerically, very difficult.   
      
   All very interesting, except it leaves me wondering:   
   can anybody here expound on this phase filter   
   thigamabob, what's the magic sauce?   
      
      
   --   
   Rich   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)