"Version: 20180701"--Title page verso.Includes bibliographical references.1. Preliminaries -- 1.1. Why is lens design hard? -- 1.2. How to use this book2. Fundamentals -- 2.1. Paraxial optics -- 2.2. Lagrange invariant, thin-lens equation -- 2.3. Pupils3. Aberrations -- 3.1. Ray-fan curves -- 3.2. Abbe sine condition -- 3.3. Higher-order aberrations -- 3.4. Spot diagrams -- 3.5. Wavefronts and …