This is a naked PST etalon that I used as a contrast booster for imaging with my Quark Chromosphere. I have now built a high resolution H alpha telescope (pictured), so this etalon is no longer required. It has a 2" nosepiece and a T2 adaptor that screws into the PST etalon, a 2" eyepiece holder is on the rear of the etalon. All threads on the nosepiece's and the eyepiece holder are M50x1.0
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.
Please note that I am selling these items as project parts only and will not accept any liability for misuse.
If you are not an experienced Solar astronomer I strongly advise that you do the appropriate research on the use of PST etalons,.
