From: paul.delamusica@gmail.com   
      
   Hi,   
      
     I am trying to do Hartmann test on a camera lens by putting a screen with   
   holes in front of the lens. I took a few shots but can't figure out what I am   
   seeing. The original paper was in German that I can't read.   
      
     I am looking for a somewhat modern reference for the Hartmann test (not   
   Shack-Hartmann test that require expensive equipment). Can someone help me   
   with a pointer?   
      
   Thanks,   
      
   Paul   
      
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