The app has potential...

Unfortunately, it has too many bugs an falls short. Dont bother programming in your prime lenses, as the app wont let you adjust the aperture with fixed
focal length lenses... for some reason, after I added a prime lens, I ended up with the same problem on all of my other lenses... I currently have 2 DSLR bodies programmed in, along with 2 16mm cine cams and 3 hdv cameras, and none of them calculate properly when paired with any lens since I added my 50mm prime lens... a huge disappointment for 4 bucks, but once this is fixed its so worth the money!

DriftBanana about f/8 DoF Calculator