NIKON - Nikkor 50mm f1 8 ais disassembly

Comprehensive technical manual for disassembling and adjusting the Nikkor MF 50mm/1.8 AIS lens. This repair guide delivers step-by-step instructions for accessing internal components, supported by annotated photographs documenting each disassembly stage. You'll work through removal of the front nosepiece, extraction of the brass retaining ring and focus ring, and exposure of the focus helicoid and lens assembly. The guide addresses focus errors directly—specifically when a lens won't focus to infinity or overshoots infinity—with a focused, minimal-intrusion approach that avoids unnecessary complete disassembly. Detailed procedures cover focus ring positioning, retaining screw adjustment, and field testing with a camera body for precise calibration. Critical precautions on reassembly and nosepiece reinstallation ensure proper operation and prevent binding at infinity focus. An essential reference for lens technicians and experienced enthusiasts performing focus adjustment work on this classic Nikon manual-focus design.