Canon FL 100mm f/4.0 for the ancient Canon FT-QL. This is definitely that era's consumer grade lens and is about the same size as native m43s lenses. It adds an interesting 'filmic' quality to the photos while using only the sharpest center portion of the projected image. It is also a complete and total PITA to use, but sometimes, it's worth it. Other times, not so much. It has it's moments.