Based on some e-mail exchanges with someone at Gaoersi, I went out and purchased a Fuji 90/5.6 . Unfortunately, the diameter of the rear lens group is too large to move far enough forward to thread into the shutter, let alone move forward during focusing. I appreciate the insight about the Schneiders and may have to try that next, although I'm going to be broke before long. At the moment, I'm second guessing myself and wishing I would have bought a complete camera. Again, I appreciate the comments and am learning plenty about the intricacies of lenses and fixed mounts.