I have for sale a Phase One H101 P21+ digital back for Hasselblad H1, H2. This back is an 18MP back and I have used it on both the H1 and H2 Hasselblads. It should also work on the H4X, but I haven't tested it. I have 4 batteries for the back and two chargers. I will supply it in a Pelican case but the case weighs 3Kg, so postage is an issue. You can use Capture One software as a free download for Phase One Digital Back users. I can package the back with a Hasselblad H1 body for an additional $800 or an H2 body for $1250 or with a film back for $300.