JUPITER - Jupiter 3 Contax Leica Conversion

Comprehensive technical guide for converting a Carl Zeiss Jena 5cm F1.5 Sonnar lens from Contax mount to Leica mount using a Jupiter-3 base. This manual covers the complete optical modification process, including identification of essential components (optics module, focus mount, shims), disassembly procedures, and adjustment techniques. The document provides precise specifications on focusing distances, back focal length calculations, and optical formulas required to ensure correct infinity focus. Detailed instructions explain how to separate the Zeiss optics module from its original mount, how to adapt the Jupiter-3 variable stand-off ring when necessary, and how to properly install the Zeiss optics into the Jupiter-3 focus mount. Complete equipment list (jeweler screwdrivers, aluminum, shim materials) and step-by-step procedures with illustrative photographs. Includes comparative analysis of focus travel requirements between the Zeiss standard configuration and Leica calibration. Essential resource for vintage camera enthusiasts and optical restoration technicians.