From: luweitest@address.invalid   
      
   I took a photo of full moon several days ago, using my iphone4s' camera,   
   with flash off, HDR (high dynamic range, IIRC) open. I found there is a   
   dark ring surrounding moon, then a bright halo (sky is clear). The halo,   
   I think, is by the scattering of atmosphere near the path of moon light   
   (Rayleigh scattering) , and for the dark ring (and there even seems a   
   second obscure dark ring), maybe only diffraction can explain, but how?   
      
   This is the photo I take:   
   http://postimg.org/image/uptiq1trl/   
      
   --   
   Regards,   
   Lu Wei   
   PGP key ID: 0x92CCE1EA   
      
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