Have you ever wished your 2" eyepiece barrel was just a little longer? For those of us who use eyepieces in different focal length telescopes frequently, we often encounter the problem of needing more focus travel for certain eyepieces. A time-honored remedy has always been to simply pull the eyepiece out of the focuser as far as it will go... But there are times when it isn't far enough.
With the Tele Vue EBX-2120 Extension, you can now add another 2" onto any Tele Vue threaded 2" eyepiece barrel. Just twist it into place just like you would a filter... and enjoy the fact that the extension is also threaded for a filter!
If you use different eyepieces with different focal lengths as you view, there is a time when the barrel of one may not have enough length. Now you can simply add this extender to help you achieve proper back focus.