This is a naked PST etalon that I used as a contrast booster for imaging with my Quark. I'm downsizing to a smaller H alpha telescope , so this etalon is no longer required. It has a 2" nosepiece and a T2 adaptor that screws into the PST etalon, A 1 1/4" nose piece can be screwed into the T2 adaptor. A 2" eyepiece holder is on the rear of the etalon.
The two diverging lenses have been removed, they can be replaced and the etalon can be used in a PST mod. There are no blocking filters or other parts.
