I've only done testing with them in 1:1 crop mode and they perform well that way. I'm sure other crops would work too—the vignetting is mostly at the corners of the 44x33 format—but I'd have to experiment more once I do some actual shooting with them to see what else I could get from them.Godfrey, do you generally recommend to use those lenses in 3:2 and 1:1 crop mode on the CFV II?
XPan format should be possible without vignetting ... 2.7:1 WxH or ~44x16 on the CFVII 50c sensor, about a 24Mpixel image ... but I'd have to test. At 44mm wide, you are working a bit out of the designed-for format width so I expect the extreme ends of the frame might not be quite as sharp as you might want for landscape work. I'm generally not so concerned with that issue for my work... most of the time.