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With the 77mm Canon 500D +2 diopter closeup lens, the 300 mm focuses between 2 feet and 2-1/2 feet, which is actually too close to prevent spooking a butterfly or dragonfly and that's 30-40mm wide (about 1-1/2 inches) in a crop digital frame so won't even fit a larger butterfly. The sensor is 23.7mm wide so almost 1:1 at 30mm wide. - 9-20-07-300mm-photography-Misc - Paul Furman Photography

With the 77mm Canon 500D +2 diopter closeup lens, the 300 mm focuses between 2 feet and 2-1/2 feet, which is actually too close to prevent spooking a butterfly or dragonfly and that's 30-40mm wide (about 1-1/2 inches) in a crop digital frame so won't even fit a larger butterfly. The sensor is 23.7mm wide so almost 1:1 at 30mm wide. 
 



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9-20-07-300mm-photography-Misc - Paul Furman Photography
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          Paul  Furman
  

    4236 25th Street #11     
    San Francisco     California 94114
    
 
    (415) 722-6037      
    
      paul@edgehill.net
    
  

  




 
 
 Paul Furman - Photography - Native Plants - Landscape Architect
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