Baader Q-Barlow Lens - HT-Multicoated - BQBBaader Q Barlow Lens HT Multicoated The Classic Q Barlow has been optically matched to the Classic Eyepieces, and its 2. 25X magnification gives a well spaced set of focal lengths. Its removable lens cell can also be unthreaded from the 1. 25" barrel, and directly threaded onto any of the Classic Baader eyepieces to give 1. 3X, further filling in the choice of focal lengths. Alternatively, it can be directly threaded onto the 1. 25" barrel of the Q