Paul Mutton (Jibble.org) has written an interesting small J2M3 program for calculating Depth of Field using your mobile phones. The DOF calculator can run on all phones that support CLDC 1.1 or later.
The program is suitable for 35mm cameras and it’s easy to use. First, what you need to do is enter the focal length of your lens, the aperture, and the distance to the subject you’re taking a photo of, the program then will calculate what the depth of field is.
See also: Free Download | Photo Software