David Rasberry
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Here is a link to a good article on depth of field
http://www.cookeoptics.com/cooke.nsf/0/20D9A28F243FC78B8525762C006A18CC/$FILE/Depth%20of%20Field%20Explained-F%26DTimes%20June%202006.pdf
And a link to depth of field tables for Cooke lenses.
http://www.cookeoptics.com/cooke.nsf/0/3514B282C38EC76E8525762C006D4F2B/$FILE/Cooke%20Lenses%20--%20DoF%20Tables%20--%2020090908.pdf
And a link to a simple spreadsheet that compares focal length vs horizontal angle of view for common film and digital formats:
http://www.scarletuser.com/showthread.php?t=3958
You can compare the DOF tables for different focal lengths to get an idea of how the difference required for the same AOV on different formats affects DOF.
http://www.cookeoptics.com/cooke.nsf/0/20D9A28F243FC78B8525762C006A18CC/$FILE/Depth%20of%20Field%20Explained-F%26DTimes%20June%202006.pdf
And a link to depth of field tables for Cooke lenses.
http://www.cookeoptics.com/cooke.nsf/0/3514B282C38EC76E8525762C006D4F2B/$FILE/Cooke%20Lenses%20--%20DoF%20Tables%20--%2020090908.pdf
And a link to a simple spreadsheet that compares focal length vs horizontal angle of view for common film and digital formats:
http://www.scarletuser.com/showthread.php?t=3958
You can compare the DOF tables for different focal lengths to get an idea of how the difference required for the same AOV on different formats affects DOF.