EXAKTA - Exakta Zeiss Biotar 58mm f2 Disassembly

This comprehensive repair guide provides detailed instructions for the complete disassembly and restoration of the Zeiss Biotar 58mm f/2 lens for Exakta cameras. Author K. Rhoads presents a methodical, semi-automatic approach to servicing this renowned German optical design. The document is structured in two main sections: the first addresses the focus and release assembly, covering removal of the release button, extraction of spanner rings, and crucially, the intricate reassembly procedure for the focus helicals—a notoriously challenging task with specific starting points and alignment techniques. The second section tackles the optical assembly, detailing access to and cleaning of front and rear lens elements with careful attention to element orientation and fungus removal. Throughout, precise instructions on reference mark positioning, spanner wrench usage, and appropriate lubricants (Nyogel, graphite, Molykote) are provided. The guide includes reference photographs and practical, experience-based troubleshooting advice gained from restoring a severely compromised example exhibiting stuck release mechanisms, binding aperture blades, faulty cocking mechanisms, and optical fungus. Detailed procedures ensure accurate infinity focus adjustment through spacer ring management and proper assembly sequencing.