Flashgun for Rolleiflex/cord series.
Rollei's TLR cameras except Rolleimagic don't equip with a hot shoe. So several attachment adapter for flashgun were provided.
This is how to attach the flashgun to the camera.
1. Attach the holding arm's ring of the connector to the view lens.
2. Attach the flashbulb to the connector.
(There is Rolleiflash M made exclusively for Rolleimagic. Refer to Rolleimagic.)