Cosina CSM with Cosion 50mm f1.7 Prime Lens

The Cosina CSM is a compact manual‑focus 35 mm single‑lens reflex camera introduced around 1978 in Japan. It features an M42 lens mount compatible with a wide range of interchangeable lenses. It offers shutter speeds from 4 seconds to 1/1000 second with bulb mode and a mechanical fallback speed of 1/50 second. The built‑in TTL light meter uses LED indicators in the viewfinder to guide exposure and supports ISO 25 to 3200.