This robust all-metal 2" extension tube will fit in a standard 2" telescope
drawtube and will accept 2" eyepieces and other 2" accessories.
It is sometimes used to achieve focusing with long focal length eyepieces where
focal travel on the telescope is limited. This can sometimes happen with Newtonians
and some refractors that have been designed specifically for binoviewer use. Threaded
for filters. This adaptor is 78mm (3” approximately) long and will extend the length
of the drawtube by 45mm. It has a brass compression ring.