Farpoint Eyepiece Extension Tube - 1.5 InchFarpoint Eyepiece Extension Tube 1. 5 Inch threads into a 1. 25 telescope eyepiece or focus tube to add a 1. 5 long extension. Farpoint Eyepiece Extension Tube 1. 5 Inch Farpoint Eyepiece Extension Tube 1. 5 Inch threads into a 1. 25 telescope eyepiece or focus tube to add a 1. 5 long extension. Designed with high quality stainless steel screws to prevent bending and tarnishing. Available in 1" to 3" extension lengths (see photo).