The KIPON Hasselblad V-XD 0.8x Adapter allows the use of medium format lenses (Mamiya 645, Hasselblad V, Pentax 645, Pentax 6x7, Pentacon 6) on Hasselblad XD mount cameras.
The adapter virtually eliminates any crop factor or image loss and maintains a diagonal angle of view. It reduces the focal length by 0.8, and it also multiplies the focal length by 0.8 so that the effective focal length becomes shorter and the shooting range is larger.
The adapter's built-in 3 groups of 5 optical lenses increase the aperture by one stop so that f/2.8 becomes f/2, while the reduced depth of field produces a desirable blur. The KIPON optic employs a telecentric design to let light come to the digital sensor vertically as far as possible, actually improving the performance of some lenses.