Lumicon 1" (25mm) Extension Tube for 1.25" Eyepieces & Acc.

The Lumicon 1" (25mm) Extension Tube for 1.25" Eyepieces & Acc. threads on to the 1.25" filter threads of an eyepiece or other accessory, and provides up to 1" of extension.  This is often necessary to correct the distance of the focal plane of a camera or video recording unit when a telescope's eyepiece has been removed.