I just noticed the iphone screenshot. WTH? Focus point in the example is 5ft 26in? Isn't that the same as 7ft 2in? Or 86 inches? What kind of weird, illogical, un-intuitive interface is that?
LOL! I hadn't noticed that. Perhaps some people find it easier to think in terms of 36" rather than 3'. At least that's the only explination I can think of. Thanks for pointing that out!
I've got a Java app on my Nokia phone (6288, S40v3) that calculates DoF. Works for all cameras, if you know the 'crop factor'. I'll try to check where I got it from, if I forget or you are interested, feel free to remind me via PM.