Craig: I neglected to add that you can fully implement the Phil Davis method of film testing into a comprehensive easily mastered system ( called, "ExpoDev" ) that is inexpensive, and which is now available as an APP for an iPhone. One loads the film testing data from Fred into the program, meters ( incident metering is best for the Beyond The Zone System approach, but reflected metering and the Zone System can be used as well ), and after entering the data into the program on your iPhone, you read the correct exposure at various F stops, etc., etc. Moreover, the program tells you the ideal developing time for the paper that you are planning to use such that your negative can more exactly "fit" the characteristics of the paper. Fred can help you through the details. The attendant costs are quite reasonable, and the time saved in materials and effort will be be paid back many times.

Go to and have a look around.