H16 Zoom Lenses
The range of Kern Zoom lenses all with the name Vario Switar are so specifically designed around the Bolex H16 Reflex camera, that Non Reflex versions of these lenses were never made.
If you happen to obtain a C mount version of one of these lenses it is unlikely you will be able to attach it to anything other than a Bolex camera as the push button release protrudes backwards towards the camera.
Another factor of these lenses is the automatic iris which will give wrong readings if used on any other camera except a Bolex. You could use it manually but you would also have to adjust your readings by 25%.