[Dabhand16]

Fi - the infinity mark is at the very end of the scale at the furthest end of the range. If you do not have it marked, just go the the furthest point of focus on the lens you have.

Another tweak is from memory, I think the depth of the hyperfocal focus range extends further away/behind the point of focus than in front of it, so the very deep depth of field range as described by OP can be achieved with lenses that are not very wide angle (that usually have greater DoF than normal/telephoto lenses) by bringing the focus point back a little from infinity, thus also bringing the DoF nearer to the camera. The greater Dof behind the focus point will then take care of anything further away. I seem to remember some of my old lenses actually having this marked on a scale on the lens itself, although it was not very accurate, it did give an idea of the DoF at any given apatuere.

OP - if this is in the calculator, my appologies - I can't access the link on my work computer.