Using the "A" adapter included, you can connect the Baader Hyperion Zoom 2.25x Barlow lens to any Hyperion Zoom 8-24mm eyepiece or to other eyepiece that has the thread for 31,8mm diameter filter.
Using the T2 "B" adapter included, the Baader Hyperion Zoom 2.25x Barlow lens is used as a powerful 2,25x telextender.