2" 40mm Eyepiece Barrel Extension Recommended Tele Vue 5 Years

Tele Vue 5 Years

Experience our best optical performance with EdgeHD’s aplanatic

and its annoying presence at the outskirts of an image can be a bane for astronomers of all levels

— David Nagler Specifications

Optical performance for huge sensors with diagonals of up to 52mm wide is still excellent

2" 40mm Eyepiece Barrel Extension Recommended Tele Vue 5 YearsExtension focal length: 40mm. Total length: 70mm. Extension tube provides extra focuser "back travel" often needed for short range terrestrial viewing through a telescope, or for astrophotographic applications Fits in 2" telescope focusers, and accepts 2" eyepieces or accessories. Threaded for use with standard 2 Inch astrophotography filters Features a locking thumbscrew to secure any inserted astronomy accessory, with a brass compression ring to