Olympus's classic normal prime — 50mm f/1.8 for OM-mount film cameras with Zuiko optics.
The Olympus Zuiko 50mm f/1.8 is the standard normal prime for Olympus OM-mount film SLRs — one of the most produced lenses in photography. Zuiko optics are well-regarded for sharp, contrasty results. Multiple versions exist across the OM era.
Optically good — sharp from f/4 with acceptable performance at f/1.8. The Zuiko optics deliver excellent contrast and colour. Manual focus with the smooth, precise Olympus OM helicoid. Simple 6-element optical design. The f/1.8 provides useful low-light capability.
Olympus OM mount with 49mm filter thread. Very compact and lightweight — typical of the OM system's miniaturisation philosophy. Manual focus. Aperture ring. Metal construction. Full-frame 35mm film coverage.
Available used very cheaply — millions were produced. Adapts to modern mirrorless cameras via OM-mount adapters for creative manual-focus use. Check for smooth focus ring and clear optics — haze can develop. A classic normal prime that defined the OM system.