164ff44f   
   From: greif1-nospamhere@rochester.rr.com   
      
   On 10/29/2012 1:58 PM, Helpful person wrote:   
   > On Oct 27, 10:54 pm, gr  wrote:   
   >   
   > snip   
   >   
   >> Using this data a very exact focal length can be calculated.   
   >   
   > Only in the absence of distortion or knowing it's value (and the other   
   > values) accurately.   
   >   
   > http://www.richardfisher.com   
   >   
   I had the luxury of only dealing with very low distortion lenses,so it   
   worked for me!   
      
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