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PhotoNotes.org - Lens Comparison
[http://photonotes.org/cgi-bin/lens-lookup.pl?lens1=EF+28-80mm+f3.5-5.6+USM&lens2=EF+28-80mm+f3.5-5.6+IV+USM&lens3=*&lens4=*&lens5=*] - - public:lowly
Canon EOS Beginners' FAQ III - Lenses
[http://photonotes.org/articles/beginner-faq/lenses.html] - - public:lowly
consider the metal lens mount 28-80 3.5-5.6 USM (not one of the later plastic lens mount models with Roman numerals)
Canon EF 70-200mm f/4.0 L IS USM Lens Review
[http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?FLI=0&API=0&FLIComp=0&APIComp=0&LensComp=0&CameraComp=0&Lens=404] - - public:lowly