
Somewhere in between can also be done. The OM1 is slightly more expensive than the R7, but has a scanning speed four times faster (using 1/125 s for a scan), making rolling shutter that much less likely.The only cure for rolling shutter is to have a camera with a 'global' sensor, where the whole image is scanned at the same time, rather than in bands. These cameras are few and far between and are expensive.
Niels