This helped: https://secure.wikimedia.org/wikipedia/en/wiki/Depth_of_field#Derivation_of_the_DOF_formulas https://secure.wikimedia.org/wikipedia/en/wiki/Depth_

This helped: https://secure.wikimedia.org/wikipedia/en/wiki/Depth_of_field#Derivation_of_the_DOF_formulas https://secure.wikimedia.org/wikipedia/en/wiki/Depth_of_fiel... Still do not know how sensor size affects things. Will read more, and hopefully will be able to construct a single mathematical model that couples all of these together.