Field Tools (Depth of Field) app for iPhone and iPad

Field Tools is an efficient, easy to use depth of field calculator for photographers working in the field. Using just a few touches, you can quickly calculate hyperfocal, near focus and far focus distances, all from a single screen. App settings are also a single touch away. Features include:
•Large, easy to read result display
•Switch distance type - hyperfocal, near limit, far limit and combined near/far limits - with a single touch
•Sliders for adjusting focal length, aperture and focus distance
•Configure multiple cameras and lenses and switch between them with just a few touches
•Results in meters, feet or feet and inches