A telephoto prime lens with an M42 mount.
The Pentacon 300mm f/4 is a telephoto prime produced by VEB Pentacon in Dresden, East Germany, for the M42 screw mount. Pentacon (formerly Meyer-Optik Görlitz and Zeiss Ikon predecessor factories) produced a range of lenses under the Pentacon brand for the M42 system. The 300mm f/4 provides significant telephoto reach for sports, wildlife, and nature photography.
300mm focal length, f/4 maximum aperture, M42 screw mount, East German manufacture, multi-coated elements.
The Pentacon 300mm f/4 offers good telephoto performance for M42-mount cameras and adapted mirrorless use. East German optical manufacturing in this era was technically competent, and Pentacon lenses are well-regarded for their build quality and glass quality. A practical long telephoto for the M42 system.
Inspect for fungus, haze, and coating condition — long telephoto lenses are more susceptible to internal condensation and fungal growth. Confirm M42 thread engagement is clean. Check aperture blades for oil. Test focus helicoid smoothness.