Bought a Fotodiox M42 - EOS adapter for my Jupiter-9 and Industar-50. Figured I'd get the OM one while I was ordering. Been trying to find out whether the 50/1.8 is safe to use on a 1Ds II. I think it has more clearance than a 5D so if it works on a 5D I should be ok... but can only find info on the 50/1.4