Neither Leitz nor any 3rd part ever made any extension tubes for M lenses, for obvious reasons . . well, the reasons aren't that obvious anymore - so I took a contraption I got some 25 years ago that allowed you to carry an extra lens underneath your Leica, cut off the mount part, glued it to a camera house cap and drilled out sufficiently in the center to let a full frame get through. Primitive, and I prefer to hold on to the Noct . . but it gets me some interesting macro shots . . at 0,95