Lumicon Cassegrain Tele-Extender threads onto male “visual-back” threads (1.375″ x 20 tpi) and presents male T-threads (42mm x 0.75mm) for camera attachment.

Lumicon Cassegrain Tele-Extender

Lumicon Cassegrain Tele-Extender threads onto male “visual-back” threads (1.375″ x 20 tpi) and presents male T-threads (42mm x 0.75mm) for camera attachment. Measures 3" in length and is used for prime focus photography on Schmidt-Cassegrain telescopes with 1.25″ visual-backs.