Baader T-2 male thread Photo-Adaptor with 2″ inner and M48 filter thread.
This is a standard 2" T-2 nosepiece with safety groove, with a T-2 thread on the focus side, giving an effective focal length of just 2.5mm.
The telescope side has an internal M48 thread for 2" filters, along with an internal T-2 thread for other adaptions.
Our used item is in perfect condition, but re-boxed for shipping as the previous owner disposed of the original box.