XPimage M645-GFX 0.71x Locking Adapter for Mamiya 645 Lens to Fuji GFX 50 Camera
The 0.71x optic adapter gets rid of crop factor, and increases the aperture. 0.71x optic. Lens: Mamiya 645 Mount Lens. It's a locking version adapter. which will make the connect of lens / adapter very firmly.