The Mamiya SCA3951 Adapter is specific for use with the Mamiya 645 AF body. It is designed to be used with the Metz SCA3000 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
If a shoe-mount Metz 40MZ-3i or a handle-mount Metz 50MZ-5 is to be used with the 645AF body, the Mamiya SCA3951 module is required on both of these flash units for full TTL operation
Use of an SCA300 System strobe requires the separately available SCA3000 converter
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, a Metz SCA3000C adapter is required (Metz #5592)