Bolex Aspheron Lens

This is the Super-8 version,  but it also works with standard 8mm and 16mm.  Fits in front of wideangle camera lens to give ultra wideangle.  Rear screw is 55mm.  You may need an additional 55mm ring as a spacer.  And your camera lens  has to be at a close focus setting to get infinity focus. Nice sharp images.