CANON - canon lens 135
by CANONThis comprehensive service manual for two professional Canon lenses—the EF135mm f/2.8 SF and EF300mm f/2.8L—delivers the technical depth required for precision repair and maintenance. The manual covers optical specifications, autofocus operation, and complete disassembly and reassembly procedures essential for technician-level work. The EF135mm section details its variable soft focus mechanism, optical design incorporating a molded spherical lens element, and the specialized adjustments needed to restore performance. The EF300mm receives extensive coverage of its advanced USM (UltraSonic Motor) system, explaining piezoelectric vibration principles and the mechanical power transmission that drive autofocus operation. Full optical schematics, element configuration diagrams, and detailed specification tables accompany every section. Adjustment procedures address focus calibration, pulse width settings for aperture control, and the critical Best Focus Adjustment service steps. Electrical diagrams, circuit board layouts, and schematic circuits support accurate troubleshooting and repair work. Instructions for AFD and EMD unit disassembly include sealing and surface treatment recommendations to ensure reliability after service. An indispensable workshop manual and repair reference for Canon service technicians working with these professional lenses.
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Document Details
- Format
- Pages
- 57
- Size
- 12.0 MB
- Category
- Photography