- 1 3/16
- Tele Vue
Simple item. It fits. It works.
The item I ordered was shipped quickly...right one.
To bring my video camera to focus on my Dob, I use a shortened set of truss poles. Now with the barrel extender, I can also use my 13mm Ethos. I have the best of 2 worlds-a set up for both video and visual viewing without having to switch truss poles.
Excellent barrel extender for focusing telescopes requiring backfocus
This solved the problem of bringing telescope images to focus with my TeleVue 2 inch eyepieces on a refractor.
EBX 2021 Extension
The product details state, "... you can now add another 2" onto any Tele Vue threaded 2" eyepiece.." I didn't really expect this extension to add another 2' to my eyepiece, but was hoping it would. It does add 1 3/16" which is really all I need.
Not for any 2" eyepeice barrel
Beware - the thread on this adapter is for tele-vue eyepieces ONLY. The thread is not the same as a standard 2" eyepiece filter. I just bought 2 of these and after about 1 turn, the threads lock up. Seems they are the same OD but slightly different pitches. Will be returning. I'm sure if you have a TV eyepeice it'd be great. But the description could have used more clarification. 3 stars. Product not defective, but description misleading.