Once installed, the manual is stored as a PDF on your computer, typically in the \Zemax\Documents \Zemax\Help Online Community Resources: Zemax Community Ansys Innovation Space

For beginners, the manual clarifies the "Right-Handed Coordinate System" used by Zemax. It explains how light travels along the Z-axis and how tilts and decenters are applied using Coordinate Breaks. Mastering this section is essential for designing complex systems like fold mirrors or off-axis parabolas. Optimization and the Merit Function