I have used this app on Symbian and loved it, it's the fastest DoF calc (no annoying lists, buttons and what have you in other DoF calcs) - you can change the variables with one touch! And it's also very handy when it comes to explaining the notion of the depth of field to newbies - you can show very clearly what changes when the variables such as focal length, aperture and distance change. Thanks to the developer! At last I am able to thank him for his old *.jar app by buying the paid Android version.
DOF Calculator Pro at Google Play market analyse