JUPITER - Jupiter 3 Contax Leica Conversion

Comprehensive technical manual for converting a Carl Zeiss Jena 5cm F1.5 Sonnar lens from Contax mount to Leica mount using a Jupiter-3 base. This service guide covers the complete optical modification workflow, including identification of critical components such as the optics module, focus mount, and adjustment shims. You'll find precise specifications for focusing distances, back focal length calculations, and the optical formulas needed to verify correct infinity focus after conversion. The repair instructions walk through separating the Zeiss optics module from its original Contax mount, adapting the Jupiter-3 variable stand-off ring where required, and properly seating the Zeiss optics into the Jupiter-3 focus mount assembly. Detailed procedures include tools needed (jeweler screwdrivers, aluminum stock, shim materials) and step-by-step instructions supported by photographic documentation. Contains direct comparison of focus travel characteristics between the original Zeiss configuration and the Leica calibrated setup, essential data for achieving correct optical performance. Invaluable for vintage camera enthusiasts, optical restoration technicians, and anyone undertaking precision lens conversion work.