METZ SCA 3951 adapter module in the original packaging new/never used.  This Mamiya adapter is specific for use with the Mamiya 645 AFD III / AFD II / AFD / AF / ZD bodies. It is designed to be used with the Metz SCA 3000 System strobe. This connector provides various useful features, including TTL direct flash control and a power zoom function that automatically matches the coverage angle to the focusing distance of the lens. For example, if a shoe-mount Metz 40MZ-3i or a handle-mount Metz 50MZ-5 is to be used with the 645AFD/AF bodies, the Mamiya SCA3951 module is required on both of these flash units for full TTL operation.  For example, if an older model Metz handle-mount flash is used (non-AF), and you want to maintain use of the autofocus sensor capability of the flash.