on and offline version of a very nice calculator

Depth of field scales are elegant tools for quickly and easily calculating depth of field and hyperfocal distance. Unfortunately, lens manufacturers don't engrave scales on lenses anymore. Now you can use DOFMaster to make your own scales.

Use DOFMaster to make depth of field scales for use in the field. Just set the focus distance, and read the near and far focus distances. Easily calculate the hyperfocal distance for your lens at any aperture.

www.dofmaster.com/dofjs.html