http://leongoodman.tripod.com/d70focuspart3.html
http://blog.jordanldavis.com/
http://www.uweb.ucsb.edu/~phsieh22/technical_report/technical_report.html
http://bobmphotography.com/dof.html
http://www.outdoorphotogear.com/blog/depth-of-field-explained-382
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