I purchase this as I introduced a 2" L-Enhance filter onto my .85 reducer, as without it I was unable to use the filter as the threads did not line up. It also minimally affected my back focus

It fits in between the .85 corrector/flattener and the linx astro M48 adapter on the focus tube but there is not enough inward travel to get focus. I was looking forward to using my 2" Optolong L pro on the 72 but as usual things never work.