Hi all,   
      
   Sorry for my late feedback on this topic...   
   Thanks for all your details explanation.   
   If I understand correctly, Nyquist sampling is not sufficient but with enough   
   oversampling, then the border between pixels will get less and less   
   discernable. Intuitively, I presume that if pixel size is so small that it   
   only represent one percent of    
   Airy radius (point spread function), then the contrast between two adjacent   
   pixel will be so small that it will be either immerged in the noise or not   
   properly discriminated by the ADC step.   
      
      
    Best regards,   
      
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