This book's covers contain the most understandable and usable description of the Zone System of exposure I have ever read. Instead of long complicated and often unintelligable explanations of theory, this book is written by an experienced user and teacher of the system. Chris Johnson explains the way he uses it and illustrates clearly the concepts and the zones with actual photographs as well as diagrams and graphs.
Mr. Johnson spells out clearly the way to pre visualise a scene and break it down into the tonal ranges that constitute each zone, he also goes on to show how to calibrate your camera, film, developer and paper as well as discussing the use of the Zone System with both colour film and digital capture.
I strongly recommend this book to all photography students and to anyone who wants to guarantee correctly exposed and textured images.