LESSON 6 "Zone System: Advanced" This lesson show you how to handle overcast or very sunny environments and covers the Zone Ruler, N-Developing, N+Developing, controlling exposure by expansion and contraction in exposure and development. It deals with intensification by Selenium Toner, use of the Water Bath development method and explains how to change your Personal Exposure Index. This lesson completes your understanding of the Zone System, and is important for serious B&W photographers. Includes examples of the instructor Kris Kann's Fine Print Portfolio. This lesson is part of your natural progression into Lesson 7: The Fine Print.  Includes printed text outline with quiz and optional assignments.