Vintage 35mm film camera bundled with a standard 50mm f/2 lens.
The Cosina CT-20 is an M42 screw-mount 35mm SLR produced by Cosina of Japan in the mid-1970s, sold under multiple brand names (Vivitar V3000, Revueflex, and others) as part of Cosina's OEM manufacturing model. The CT-20 represents the economy tier of M42 SLRs with manual exposure and stop-down metering. The bundled 50mm f/2 is a Cosina-manufactured standard prime.
35mm SLR, M42 screw mount, stop-down TTL metering, manual exposure, focal plane shutter (top speed typically 1/1000s). Cosina 50mm f/2: standard prime, manual focus, M42 thread.
Cosina's M42 bodies are functional, unassuming cameras — the OEM manufacturing model means the same body appeared under many brand names with interchangeable parts. The M42 mount is the primary practical advantage: vast lens ecosystem adaptable to virtually any modern mirrorless system. The Cosina 50mm f/2 is a competent standard prime. Stop-down metering requires closing the aperture to taking position before metering — less convenient than open-aperture systems.
Check stop-down metering lever function. Test shutter at all speeds (slow speeds on 1970s Cosina bodies often need service). Check light seals — standard failure point. Test M42 thread engagement. Inspect the 50mm f/2 for aperture blade oil contamination.