Major design flaw, it is not MAC compatible.
I found this quote on their site interesting:
“FoCal has taken hundreds of hours of development, during which time thousands of shots have been taken and analyzed, and a number of cameras and lenses have been profiled all to get the best possible results from the software.”
That doesn’t sound like much testing, since I have thousands of shots just getting my camera set using lensalign.
This seems like a very good tool if it will work, and fairly priced. Unfortunately no 1D IV version yet so it may be a while before I get to try it.