Best I can tell, there is a Cambo Actus Mini for (35mm) full-frame digital and a Cambo Actus DB for MF digital backs, but no Cambo Actus for a Pentax 645. Inasmuch as Pentax can't keep the 645Z on the shelves, and inasmuch as movements are not possible on a Pentax 645 (save for one relatively expensive after-market lens), I would have thought that Cambo would fill this gap. B&H sells a new Pentax 645D for about $3,800. That's a price point even a hobbyist such as myself could consider, but if I'm going to switch from 4x5 film to MF digital I'm going to want an opportunity to learn movements on the new camera. Too bad.