I wrote up a short article on how ExpoDev corrects for reciprocity failure when calculating exposures. I believe it to be quite unique as the only exposure calculator I know of that corrects for over 90 different film and developer combinations, based on actual tests there were performed by Phil Davis. It is also a very flexible system that can be easily tweaked to suit your personal working processes.

http://blog.mutable.net/post/2012/02...y-failure.aspx

I'm also happy to say that ExpoDev for iOS has reached the final testing stage and will hopefully be available in the iTunes App Store shortly.

David