Alpine Astronomical Baader 47mm Click-Lock Extension (2")

The Alpine Astronomical Baader 47mm Click-Lock Extension features a 47mm long 2" Click-Lock unit plus a 2" eyepiece barrel. Unscrewing the barrel reveals standard 2" Schmidt-Cassegrain telescope (SCT) visual back threads that allow it to be directly connected to the back of SCT optical tube assemblies for visual use with large eyepieces.