CANON - Canon EF 20mm f28 USM Parts

Official parts catalog for the Canon EF 20mm f/2.8 USM lens (reference C21-5341), essential documentation for technicians performing disassembly, repair, and reassembly work. The catalog features detailed exploded-view diagrams showing the complete optical and mechanical architecture of the lens, with each component and subassembly clearly identified. A comprehensive parts list organized by functional category provides part numbers, specifications, quantities required, and component descriptions for all internal elements. Technical diagrams illustrate the lens group assemblies (CY1-2462, CY1-2463), focusing ring mechanism (CY1-2414), focusing units, diaphragm assemblies, and all optical and mechanical components. Supplementary exploded views detail adapter collars, fastening elements, and electronic control circuits. Dimensional data is included for standard parts where size variants exist. A longitudinal cross-sectional diagram rounds out the documentation, showing the precise spatial arrangement of lens elements and internal assemblies, making it straightforward to understand how all mechanical and optical components relate to one another within the complete lens system.