This is a naked PST etalon that I used as a contrast booster for imaging with my Quark Chromosphere.
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, here is a good example
https://markmcintyreastro.co.uk/wp-c...risonR5e-1.pdf
I am selling it as I'm upgrading to a higher spec Solar filter .
Selling for $400 posted Australia wide.