The Hasselblad lens to EOS body adapter, which is the same good metal model as of my old Hasselblad to Minolta adapter. The test was done with the 1D Mk2 on tripod, manual focus, Av mode, mirror lockup & remote release. The sharpest image from each lens was picked as representative, in order to minimize the focusing error. A series of shots at various f stop were taken with each lens.