GeT Cameras has invented a special C-mount to M12 mount adapter to easily use M12 lenses on a C-mount camera. This adapter is compatible with all M12 lenses GeT Cameras sells. Additionally, this adapter can also be mounted on a CS-mount camera, making it a very universal adapter. The exploded view shows that the M12 lens (5) is fixed by a M2 screw in the M12 lens holder (3). The M12 lens holder (3) is screwed into the C-mount base ring (1). By turning the M12 lens holder (3) you can focus the M12 lens. When the M12 lens is in focus you can use the locking screw (17) to fixed the M12 lens in the correct position.
The adapter thread is M22.5xP0.5. You can install a filter if the M12 lens does not egress the top of the adapter.