Forgotten in its old age

by Aditya

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Okay, I'm pretty sure this checks out, but haven't yet sanity-checked it with any physical lenses. Let's say 0 and 1 represent the distance scale / focus ring position at the MFD mark and infinity, respectively. Then 0.5, for instance, would mean turning the ring halfway between the extremities. Then, we have a hyperbolic curve like this: a = 1 - dmfd ...

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