From AMS - Aptitude for Mobility Software:
Multicalc for camera (fm) is an app for photography professional and passionates who need a quick tool to calculate common values while using a camera.With this app you can look for a set of values with the requirements you need (and save it within an email message if needed).Current version of the app takes into consideration the following values: F-stop, shutter speed, iso speed, exposure compensation, flash compensation (main and slave flash), flash guide number, circle of confusion, exposure, subject distance, focal length, hyper-focal distance, depth of field, near focus distance, far focus distance, focus before subject, focus behind subject.Here they are some features that you may find interesting if you are looking for a camera calculator1 - The app has been realized in order to allow, for each used equation, to specify which variable you want to calculate. For instance, you can calculate exposure given a set of camera settings, but you can also calculate which aperture to use with a given exposure and shutter speed, or which focal length to get a given depth of field.2- When you insert a value you can choose among a list of common values, but you can also enter manually the exact value. The app takes, retains and calculates with potentially unlimited decimals. Tap once to get the common values, double tap to insert manually.3- Most of used equations are clearly indicated, results don't come out of the blue. By the way, any suggestions about more precise or indicated equations will be welcome.4- Last but not least: each time a value is modified (manually or as a result), all the equations which contain the same values will update their results as well. This way, while browsing among formulas, you can build a set of values with the requirements you are looking for. Then, from any point of the app you can access the complete set of values (and send them via email). Enough talking!Multicalc for camera comes in two versions: the present one, with no advertising and access to the complete set of equations (both present and those still to come), and a free version, called Multicalc for camera (fg), with a bit of advertising and access to a limited set of equations.