CANON - Canon EF 100 400mm f45 56L IS USM Parts

Complete parts catalog for the Canon EF 100-400mm f/4.5-5.6L IS USM telephoto lens (reference C21-9961). This service manual delivers comprehensive technical documentation of every component and subassembly, with detailed exploded-view diagrams and precise part identification throughout. The five pages of technical illustrations cover the progressive disassembly sequence: front optical group, focusing lens elements, intermediate optical groups (3rd through 6th), and the image stabilization system. Over 100 individual parts are cataloged and organized by functional category—collars, fasteners, springs, barrel assemblies, rings, sensors, flat cables, housings, and complete subunits—each carrying its unique part number for straightforward ordering and identification. Critical tolerances and dimensional specifications are provided for essential elements. The manual documents both current and superseded part variants, including differences in tripod socket units (YG9-0263-000 versus YG9-0263-100) and focusing drive bands (CY1-2483-000 versus CY1-2857-000), making it invaluable for determining correct replacement parts. Repair technicians, lens restoration specialists, and optical professionals will find this workshop documentation essential for efficient disassembly, repair, and parts procurement.