CANON - Canon EF 400mmf28L IS USM Parts

Complete parts catalog for the Canon EF 400mm f/2.8L IS USM telephoto lens (reference C21-8481). This professional technical documentation provides precise identification and ordering information for every replacement component available through Canon service channels. The catalog features detailed exploded-view diagrams illustrating the complete lens assembly, with each part clearly identified by its Canon reference number for accurate ordering. Coverage spans the entire optical and mechanical construction: all lens groups (G1 through G10), focusing barrels and helicoids, control rings, autofocus drive mechanisms, image stabilization (IS) optical and electronic modules, gyro sensor units, diaphragm blades and control elements, and the complete fastening hardware (screws, washers, springs, retaining rings). Additional sections provide parts breakdowns for the ET-155 lens hood, Canon Lens Case 400 protective carrying case, and the various front and rear lens cap options. Parts are organized by functional assembly and listed with quantities, enabling technicians and repair facilities to quickly locate and order the exact components needed. An indispensable workshop reference for authorized Canon service technicians, professional repair facilities, and lens owners who need to source specific replacement parts or verify component specifications for this professional-grade telephoto lens.