CANON - Canon EF24mmf28 EF100 200mm f45 Service

Professional service manual for Canon EF 24mm f/2.8 and EF 100-200mm f/4.5A lens models, specifically designed for authorized repair technicians. This workshop manual provides complete disassembly and reassembly procedures covering front lens groups, EMD and AFD autofocus drive units, and focusing helicoid assemblies. The optical characteristics section documents focal length, aperture performance, and autofocus system architecture for each lens. Detailed adjustment procedures include S-distance calibration to set proper optical element spacing, optical tilt correction for peak resolution, focus positioning, and autofocus pulse calibration. A dedicated Best Focus Adjustment service protocol guides technicians through resolving discrepancies between autofocus performance and actual optimal focus points. Full parts lists identify components with material grades and color coding. Complete electrical schematics with color-coded reference key illustrate circuit paths, connector layouts, and detailed electrical configurations specific to each model. Technical specifications and performance verification procedures ensure professional maintenance standards. This repair guide represents essential technical documentation for service centers maintaining Canon professional optics.