CANON - canon lens 80 200 20 35

Complete service manual for Canon EF80-200mm f/2.8L and EF20-35mm f/2.8L zoom lenses. This technical documentation provides comprehensive specifications, optical performance characteristics, and mechanical construction details for these professional high-aperture lenses. The manual presents optical design schematics showing lens elements at multiple focal lengths, axial chromatic aberration compensation using UD glass elements, and the advanced inner focusing helicoid system. Detailed disassembly and assembly procedures are documented for all major components including EMD diaphragm units, AFD autofocus modules, and zoom mechanisms. Dedicated sections address mechanical and optical adjustments: optical centering, infinity and close-distance focus calibration, focus brush positioning, optical tilt correction, and best focus sensor alignment. Comprehensive circuit documentation includes power supply schematics, switch functions and nomenclature, electrical component descriptions, IC pin assignments, and autofocus drive control operation. The manual incorporates full schematic diagrams, PCB layouts, wiring diagrams with detailed signal flow explanations. Expendable parts lists and related accessories are included. This service resource is essential for authorized service technicians, optical repair specialists, and maintenance personnel working with professional Canon EF mount lens systems.