I'm pretty sure I know the answer is yes, but just to be certain..
In a hypothetical situation, lets say a calculator tells me the HFD for my camera/lens/aperture is 1.3m. That 1.3m measurement needs to be taken from the subject to the film plane?
I have had conflicting answers from here and there, Some telling me its from the subject to the front element, others from the front element to the center of the lens etc..
I was certain it was to the film plane.