The latest quirk in this mystery is Super Angulon 90/5.6 won't work either. While it will thread together, it will not close focus due to lack of clearance inside the cone. The people at Gaoersi, when confronted with this and accompanying photos, claim the lens cone is not theirs, but was made by someone else. So the next question for anyone still reading this ongoing comedy, what company might make a lens cone that would fit on a Gaoersi? Are some pano lens cones interchangeable? Thanks to all once again.