<p>I could remove the nikon-part and replace the one by a special m-42-ring of a special lens. see my new thread about mounting special lens on hassi 500. already aswered. the only improvement which could be made regarding register is building a new shorter m42 ring. accidentally it is fitting into the hasselblad-part. fixed using special screws(3) which fit the thread. I did calculations comparing p67 with hasselblad and pentacon-six(for which i have a ring-solution) to know what would be the max-distance at infinity. with p67, ring removed, i have seen impressive 7m when holding the lens directly to the body.</p>