CANON - Canon EF 20mm f28 USM Parts

Official parts catalog for the Canon EF 20mm 1:2.8 USM lens (reference C21-5341). This comprehensive technical documentation is designed for service technicians and professional repair specialists. The manual features detailed exploded-view diagrams that illustrate the complete assembly structure of the lens, with precise identification of each individual component and subassembly. A comprehensive parts list is provided, organized by category with corresponding reference numbers and specifications. Each entry includes the part classification, quantity required, and detailed description. The technical diagrams showcase the lens's internal architecture, including lens groups (CY1-2462, CY1-2463), focusing ring assembly (CY1-2414), focusing units, diaphragm mechanisms, and all optical and mechanical elements. Additional exploded views highlight details of adapter collars, fastening elements, and electronic components. Dimensional variants are specified for standard parts where applicable. A longitudinal cross-sectional diagram completes the documentation, illustrating the spatial arrangement of lens elements and internal components, thereby facilitating a comprehensive understanding of the overall optical and mechanical architecture of the lens system.