Baader Planetarium Classic Q-Eyepiece Set - Classic Orthos 6,10,18mm / Plossl 32mm (incl winged eyecups), 2.25X Q-Barlow, Q-Turret quad eyepiece revolver, Baader Astro Box #1 (M31) BCQ-SET For 2.25x power, the Q-barlow lens cell can be mounted either into the barlow body (individual eyepiece holder) or directly into the 1.25" nosepiece of the Q-Turret eyepiece revolver. The resulting eyepiece focal lengths in this set with the 2.25x Barlow will be 2.7mm, 4.6mm, 6mm, 8mm, 10mm, 14mm, 18mm, 32mm. All four eyepieces can be rotated in the Q-Turret perfectly parfocally to change magnification in a wink. The lens with cell of the supplied 2.25x Q-barlow assembly can unmount from the 1.25" barlow-body and directly threads into the 1.25" nose piece of the Q-Turret for an additional set of four magnifications  also yielding a 25 mm gain in backfocus.