Originally Posted by ic-racer
What! Don't know how to use it. Well let me explain.... that I am in exactly the same boat.
I have some vague idea about how it works but an amplification from Nicholas would be gratefully received. It looks great, avoiding as it does, I think, any calculations other than simple subtraction, I think, to arrive at the fstop increase/decrease which then of course if you haven't got a fstop timer has to be translated into actual time so a fstop table to time conversion is also required. Again I think but don't know.