CANON - Canon EF 28mm f18 USM Parts

Complete parts catalog for the Canon EF 28mm f/1.8 USM lens (REF.NO. C21-5351). This service manual provides the technical reference needed by repair technicians and optical maintenance professionals to identify, source, and replace components with confidence. The document lists all assemblies with genuine part numbers, classifications, and quantities required for each subassembly. Detailed exploded-view diagrams show the full optical and mechanical construction, accompanied by disassembly and reassembly procedures that guide technicians through each step. Key sections document the optical groups (CY1-2612, CY1-2634), autofocus motor mechanism (YG2-0234), motorized diaphragm unit (YG2-0235), and precision assemblies including the focus ring, guide barrel, and light-shield components. Specification tables give exact dimensions and tolerances for critical parts, essential for accurate replacement and assembly. Whether you're performing routine maintenance or complete optical repair on this premium standard prime lens, this parts manual ensures you have the exact information needed to source the right components and understand the lens's complete mechanical and optical architecture.