Celestron Universal Barlow and T-Adapter - 1.25"This 1. 25 accessory can be used three ways: as a 2X Barlow for visual use, as a prime focus T adapter, or as a Barlowed T adapter for double the magnification and the benefit of extra inward focus travel. The Universal Barlow & T Adapter can be used as a 2X Barlow right out of the box. Insert any 1. 25 eyepiece into the chamber and youll enjoy double the magnification, while retaining all the eye relief of the inserted eyepiece. The Celestron