CANON - Canon EF 400mm f56L USM Parts

Complete parts catalog for the Canon EF 400mm f/5.6L USM telephoto lens (reference C21-8362). This professional technical documentation is essential for service technicians, authorized repair centers, and optical maintenance specialists. The catalog features detailed exploded-view diagrams presenting the complete mechanical structure of the lens, from optical elements to the camera mount. Every component is identified with its specific part number for precise identification during repair or replacement operations. The documentation includes a comprehensive parts list with original Canon reference numbers, component classifications, quantities, detailed descriptions, and page references. The diagrams cover all major sections: the optical mount assembly, lens groups (G1 through G7), motorized diaphragm unit, focusing unit, mechanical locking elements, focus ring, distance focus ring, and external components including the lens hood and rear cap. Dimensional specifications for certain optical elements are also provided. References distinguish between earlier and newer versions of specific components, facilitating accurate parts identification and compatibility verification for repair and maintenance work.