Designed for use on Pentax telescopes, but compatible with any focuser drawtube with M84 threads, the Alpine Astronomical Baader M84/M68 Pentax Adapter is used to convert large M84 female threads to the more common M68 size. With the new M68 threads, you are able to use the full line of Baader M68 adapters, tubes, rings, and other accessories on your telescope with ease.