i use the X2-Pro w/ a 5D and some Digitars (60, 80, 120). very sharp, good construction, geared movements. it appears to only be available for the ZD, which is a bummer. I'd love fot he AFD2 +zd back to work w/ this device. they do make an adapter for other Mam lenses, but I've never seen or heard of one for the 645 body. the mount for each camera centers it to the front standard - the cambo website does not list for mam 645 body. also - calumet has them instock, where as B&H it's a special order.