Adapters with 16-SP (Krasnogorsk-2) mount.
These both are 16mm film movie cameras made in USSR. They have the same mount diameter and same flange focal distance. The only difference is mount lugs width.
16-SP has wider lugs and can not be installed onto Krasnogorsk-2 camera. But Krasnogorsk-2 lens can be installed onto 16-SP camera. 16-SP cameras and lenses are more rare.
Our adapters accept both lens mount versions.