You can lower the profile of your 1.25 inch eyepiece another 0.5 inch below the drawtube. The ultra low eyepiece adapter works with any 2.0 inch focuser. The 1.25 inch eyepiece position is inset down into the adapter, dropping the eyepiece height 0.5 inch. This allows another 0.5 inch of focus travel and optimization of the secondary mirror size. Anodized aluminum, threaded for 48mm filters with compression ring. Supplied with hex key to tighten compression ring.