The Novoflex APRO APRO 35mm Camera to Balpro-1 Adapter Ring is the required adapter that makes it possible for the Balpro-1 to accept the 35mm camera brand-specific adapter rings (e.g. CANA-AF, NIKA, PENTA, etc.). It still requires a camera adapter ring.
In the Box
Novoflex APRO 35mm Camera to Balpro-1 Adapter Ring - Requires Camera Ring