I have a Hasselblad 503CW, 500C/M, and 903SWC, plus assorted lenses. I am a FILM person. I tried digital with a consumer camera, a few years ago, and not really happy. Anyway, thinking of buying and trying a digital back for the Hasslebalds, but do not want to sell my car to buy one. OK with used? Thought and suggestions greatly appreciated. I have NO idea about what models to buy or even to consider. Researched old posts on this forum but they were too old.