From: sgoptics@gmail.com   
      
   Hi there   
      
   We are trying to analyze stray light and glare in an optical system comprised   
   of long rod lenses, mounted in an uncoated stainless steel tube.   
   Part of the light hitting the long rims of the lenses is scattered back into   
   the glass. Another part is scattered out of the lens, reflected from the tube   
   walls and then scattered again into the glass lens.   
   Any idea what should we take as the BDRF of that complicated interface?   
   Some of the rays are at  or near grazing incidence, of course.   
      
   TIA   
      
   Shay Ghilai   
   sgoptics@netvision.net.il   
      
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