This book deals with the basic fundamentals, understanding, and design of optical thin films, or interference coatings for practical production. It focuses on one of the main subjects that is critical to meeting the practical challenges of producing optical coatings. This is the design of coatings, an understanding of which allows the practitioner to know the possibilities and limitations involved in reducing, enhancing, or otherwise controlling the reflection, transmission, and absorption of light (visible or otherwise). This Sixth Edition now includes measurement of index, thickness, and color; the determination of tooling factors; and the programming of Macros, Workbooks, and FilmStar Basic.