If you want the gritty details, try to have your brain absorb these formulae:
https://photo.stackexchange.com/questions/24826/is-there-a-formula-to-calculate-dof
If you want the gritty details, try to have your brain absorb these formulae:
https://photo.stackexchange.com/questions/24826/is-there-a-formula-to-calculate-dof