I am using the 50mm hassi lens on a cambo ultima 35 (a poor mans Arca Swiss M line two) with a canon 1ds mark III on the back, so far it is my favorite lens for this set up. With stiching I am getting a nice large file with a wide FOV. THe hassi 80 is also very good, I was working with the 40 CF (floating element) but was having a hard time getting edge to edge sharpness at anything but F22, and 22 is not really a great fstop to be working with on that lens, found it a bit soft. I am also working with the schneider 28 digitar (special for this camera, looks like an enlarging lens) it seems to have quite a bit of distortion at the edges. I am planing to get the M line two since it seems to be much more precise and lighter than the cambo, I also like the pin registration system for attaching the dslr body to the rear standard.