I have a varifocal zoom lens set to a desired focal length and at known distance from the subject. I also have a desired depth of field.
Given this information, can I calculate a theoretical f-number to achieve the desired depth of field?
If so, how would this be done?
Is the exposure and sensor size also required to make this calculation?
It may be possible using all of:
1) The thin lens graphing formula
2) The small angle approximation: $sin(x)$ ~ $x$ for small $x$.
3) The circle of least confusion.
Hovever a better approach might be to graph depth of field [ using whatever accuracy or lens definition criteria you are interested in ]
For specific distances and f-stops using your particular lens and sensor size. Then interpolate between these values.
