As Ed said, Gordon's book is the ultimate resource; The Film Developing Cookbook is also good. Hutchings recommends 1/3 to 2/3 more exposure for most films, and gives times for N+ and N- development.(posted 8780 days ago)I'm still brand new to PMK, but am very encouraged by it. I believe it is even sharper than Rodinal and has a better scale, too. Keep us posted on your results!