This Novoflex Mamiya 645 Lens Adapter Ring can be used - in combination with a Novoflex brand specific camera adapter ring (e.g. Universal Bellows to *-type camera adapter) - to combine a Mamiya 645-type lens (manual focus type) with other brand camera bodies.
Novoflex offers adaptors which permit the use of lenses from other manufacturers on various cameras. All adaptors retain the lens ability to focus on infinity. None of the adaptors transmit any functions between body and lens. Most cameras allow metering with the diaphragm stopped down or provide an aperture priority automatic exposure.