Camera Craftsman - 1978

This issue of Camera Craftsman focuses on the technical evolution of the renowned Olympus OM-1, the compact SLR that revolutionized the camera market. Written by Lawrence C. Lyells, the principal article examines the successive modifications made to this iconic model throughout its production run.

The technical feature provides comprehensive coverage of changes to the cord-coupling system, the core mechanism of the OM-1's automatic exposure control. It explores the ring and lever assembly on the lens-mounting ring, improvements to the diaphragm-sensing cam mechanism, and refinements to the speed-sensing ring that controls shutter synchronization.

Special emphasis is placed on the exposure meter circuitry, particularly the galvanometer and its critical role in the metering system. The document includes a detailed guide for galvanometer replacement, a key component in automatic exposure function, complete with assembly photographs and full electrical schematics. Practical advice is provided for fine-tuning exposure-meter accuracy adjustments—essential knowledge for maintaining the metrological reliability of this demanding instrument. This issue will appeal to technicians and dedicated enthusiasts performing maintenance and restoration work on OM-1 cameras.