I don't recall if the 45CF back revolves or if it is reversible. It is a VERY lightweight camera, with all the issues that come along with that. I remember looking at it when I was looking for a 4x5 field camera and getting a chance to try it out in the store. I felt it was plasticky and cheap, and that it felt like it would break easily. I don't know that a 12" Dagor would be a good choice for a portrait lens to begin with, and I don't think it would work well on the 45 CF, as the CF is essentially a double-extension camera and would not be able to focus a 12" lens to portrait distances.