How ExpoDev for iOS corrects for reciprocity failure
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.
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.