From: rrllff@yahoo.com   
      
   On Friday, August 14, 2015 at 12:06:34 PM UTC-4, Phil Hobbs wrote:   
   >   
   > Probably be okay except for the moire issue.  The squares are pretty   
   > big, so the diffraction will nearly all be at small angles.   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
   >   
   Moire could be eliminated with a random pattern of spot position and size.  Of   
   course the definition of random is a little tricky.  One could end up with   
   large dead areas.   
      
   htp://www.richardfisher.com   
      
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