the hyper-focal distance will change depending on the
lens in use..and the given
aperture.....its a point in the image if focussed on, will have enough
DOF from that point on, to extend to infinity
you can have a look at a APP for smart phones , called DOFmaster..it allows you to input your variables such as MM of the
lens and it
aperture..it will give you the Hyper-focal point in its equation as well as giving you the amount of
DOF if you aren't using the hyper-focal point
http://www.dofmaster.com/hyperfocal.html
good to use in landscapes..if you want everything in focus