I have noodled around online, but can't quite find out what I would like to know:
How are the f-stop numbers derived? i\I understand that it is a ratio of focal length to aperture . . .but can't quite get the math right. I have inklings of the natural log of 2 being involved somehow.
I do not have any pressing reason to do this, but its still early and the coffee has kicked in.
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